3a-15=-2a+40

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Solution for 3a-15=-2a+40 equation: 



3a-15=-2a+40

We move all terms to the left:

3a-15-(-2a+40)=0

We get rid of parentheses

3a+2a-40-15=0

We add all the numbers together, and all the variables

5a-55=0

We move all terms containing a to the left, all other terms to the right

5a=55

a=55/5

a=11

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