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4x+20=4(3x-3)
We move all terms to the left:
4x+20-(4(3x-3))=0
We calculate terms in parentheses: -(4(3x-3)), so:We get rid of parentheses
4(3x-3)
We multiply parentheses
12x-12
Back to the equation:
-(12x-12)
4x-12x+12+20=0
We add all the numbers together, and all the variables
-8x+32=0
We move all terms containing x to the left, all other terms to the right
-8x=-32
x=-32/-8
x=+4
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