12-a+3a=4

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



12-a+3a=4

We move all terms to the left:

12-a+3a-(4)=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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