3a-7=a-15

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Solution for 3a-7=a-15 equation: 



3a-7=a-15

We move all terms to the left:

3a-7-(a-15)=0

We get rid of parentheses

3a-a+15-7=0

We add all the numbers together, and all the variables

2a+8=0

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

2a=-8

a=-8/2

a=-4

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