Solve for X: -1/8x + 4 = 7x - 4/5 Linear Equation

Question

Solve for X:

18x+4=7x45 -\frac{1}{8}x+4=7x-\frac{4}{5}

Video Solution

Solution Steps

00:00 Solve
00:04 We want to isolate the unknown X
00:37 We will reduce what we can
00:59 We will group terms
01:09 We will convert numbers and fractions to improper fractions
01:15 We will multiply by the reciprocal fraction to isolate X
01:35 We will carefully multiply numerator by numerator and denominator by denominator
01:42 We will reduce what we can
01:45 And this is the solution to the question

Step-by-Step Solution

To solve the equation 18x+4=7x45-\frac{1}{8}x + 4 = 7x - \frac{4}{5}, follow these steps:

Step 1: Move the xx terms to one side of the equation.
Add 18x\frac{1}{8}x to both sides:

18x+18x+4=7x+18x454=7x+18x45 -\frac{1}{8}x + \frac{1}{8}x + 4 = 7x + \frac{1}{8}x - \frac{4}{5} \\ 4 = 7x + \frac{1}{8}x - \frac{4}{5}

Step 2: Simplify by combining like terms. Combine xx-terms on the right:

4=(7+18)x45 4 = \left(7 + \frac{1}{8}\right)x - \frac{4}{5}

Step 3: Express 7+187 + \frac{1}{8} as a single fraction: 568+18=578\frac{56}{8} + \frac{1}{8} = \frac{57}{8}.

Step 4: Substitute back:

4=578x45 4 = \frac{57}{8}x - \frac{4}{5}

Step 5: Move the constant term to the other side. Add 45\frac{4}{5} to both sides:

4+45=578x205+45=578x245=578x 4 + \frac{4}{5} = \frac{57}{8}x \\ \frac{20}{5} + \frac{4}{5} = \frac{57}{8}x \\ \frac{24}{5} = \frac{57}{8}x

Step 6: Solve for xx by dividing both sides by 578\frac{57}{8} (multiply by 857\frac{8}{57}):

x=245×857x=192285 x= \frac{24}{5} \times \frac{8}{57} \\ x = \frac{192}{285}

Therefore, the solution to the problem is x=192285 x = \frac{192}{285} .

Answer

192285 \frac{192}{285}