x+3+4x=-12

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



x+3+4x=-12

We move all terms to the left:

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

We add all the numbers together, and all the variables

5x+15=0

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

5x=-15

x=-15/5

x=-3

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