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X+20=16-3X
We move all terms to the left:
X+20-(16-3X)=0
We add all the numbers together, and all the variables
X-(-3X+16)+20=0
We get rid of parentheses
X+3X-16+20=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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