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X=39.9-3X+1.7
We move all terms to the left:
X-(39.9-3X+1.7)=0
We add all the numbers together, and all the variables
X-(-3X+41.6)=0
We get rid of parentheses
X+3X-41.6=0
We add all the numbers together, and all the variables
4X-41.6=0
We move all terms containing X to the left, all other terms to the right
4X=41.6
X=41.6/4
X=10+1/2.5
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