3a+5=5a-7

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Solution for 3a+5=5a-7 equation: 



3a+5=5a-7

We move all terms to the left:

3a+5-(5a-7)=0

We get rid of parentheses

3a-5a+7+5=0

We add all the numbers together, and all the variables

-2a+12=0

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

-2a=-12

a=-12/-2

a=+6

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