Solve the following equation:
?−(−13)=−23 \text{?}-(-13)=-23 ?−(−13)=−23
First let's remember the rule:
−(−x)=+ -(-x)=+ −(−x)=+
Now let's rewrite the exercise in the appropriate form:
?+13=−23 ?+13=-23 ?+13=−23
Then we'll add -13 to both sides to cancel out the left side:
?+13−13=−23−13 ?+13-13=-23-13 ?+13−13=−23−13
Finally we get:
?+0=−36 ?+0=-36 ?+0=−36
?=−36 ?=-36 ?=−36
−36 -36 −36