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X-3(6-X)=20
We move all terms to the left:
X-3(6-X)-(20)=0
We add all the numbers together, and all the variables
X-3(-1X+6)-20=0
We multiply parentheses
X+3X-18-20=0
We add all the numbers together, and all the variables
4X-38=0
We move all terms containing X to the left, all other terms to the right
4X=38
X=38/4
X=9+1/2
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