x+12+3x=8=40

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Solution for x+12+3x=8=40 equation: 



x+12+3x=8=40

We move all terms to the left:

x+12+3x-(8)=0

We add all the numbers together, and all the variables

4x+4=0

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

4x=-4

x=-4/4

x=-1

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