3a-4a=-3a-12

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



3a-4a=-3a-12

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1a-(-3a-12)=0

We get rid of parentheses

-1a+3a+12=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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