3+4x=x-12

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



3+4x=x-12

We move all terms to the left:

3+4x-(x-12)=0

We get rid of parentheses

4x-x+12+3=0

We add all the numbers together, and all the variables

3x+15=0

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

3x=-15

x=-15/3

x=-5

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