x+3x+12=-20

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Solution for x+3x+12=-20 equation: 



x+3x+12=-20

We move all terms to the left:

x+3x+12-(-20)=0

We add all the numbers together, and all the variables

4x+32=0

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

4x=-32

x=-32/4

x=-8

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