3a+7=4-12

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Solution for 3a+7=4-12 equation: 



3a+7=4-12

We move all terms to the left:

3a+7-(4-12)=0

We add all the numbers together, and all the variables

3a+7-(-8)=0

We add all the numbers together, and all the variables

3a+15=0

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

3a=-15

a=-15/3

a=-5

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