x+3x=-72

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Solution for x+3x=-72 equation: 



x+3x=-72

We move all terms to the left:

x+3x-(-72)=0

We add all the numbers together, and all the variables

4x+72=0

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

4x=-72

x=-72/4

x=-18

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