x+3x+-4=-20

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Solution for x+3x+-4=-20 equation: 



x+3x+-4=-20

We move all terms to the left:

x+3x+-4-(-20)=0

We add all the numbers together, and all the variables

4x+16=0

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

4x=-16

x=-16/4

x=-4

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