7a+3-2a=-12

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Solution for 7a+3-2a=-12 equation: 



7a+3-2a=-12

We move all terms to the left:

7a+3-2a-(-12)=0

We add all the numbers together, and all the variables

5a+15=0

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

5a=-15

a=-15/5

a=-3

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