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6x+3(1-3x)=63
We move all terms to the left:
6x+3(1-3x)-(63)=0
We add all the numbers together, and all the variables
6x+3(-3x+1)-63=0
We multiply parentheses
6x-9x+3-63=0
We add all the numbers together, and all the variables
-3x-60=0
We move all terms containing x to the left, all other terms to the right
-3x=60
x=60/-3
x=-20
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