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-18x-3(2x-2)=21x+3
We move all terms to the left:
-18x-3(2x-2)-(21x+3)=0
We multiply parentheses
-18x-6x-(21x+3)+6=0
We get rid of parentheses
-18x-6x-21x-3+6=0
We add all the numbers together, and all the variables
-45x+3=0
We move all terms containing x to the left, all other terms to the right
-45x=-3
x=-3/-45
x=1/15
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