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4x-3(2x-2)=21
We move all terms to the left:
4x-3(2x-2)-(21)=0
We multiply parentheses
4x-6x+6-21=0
We add all the numbers together, and all the variables
-2x-15=0
We move all terms containing x to the left, all other terms to the right
-2x=15
x=15/-2
x=-7+1/2
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