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3=2x-3(4x-21)
We move all terms to the left:
3-(2x-3(4x-21))=0
We calculate terms in parentheses: -(2x-3(4x-21)), so:We get rid of parentheses
2x-3(4x-21)
We multiply parentheses
2x-12x+63
We add all the numbers together, and all the variables
-10x+63
Back to the equation:
-(-10x+63)
10x-63+3=0
We add all the numbers together, and all the variables
10x-60=0
We move all terms containing x to the left, all other terms to the right
10x=60
x=60/10
x=6
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