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189=6x+3(5x+14)
We move all terms to the left:
189-(6x+3(5x+14))=0
We calculate terms in parentheses: -(6x+3(5x+14)), so:We get rid of parentheses
6x+3(5x+14)
We multiply parentheses
6x+15x+42
We add all the numbers together, and all the variables
21x+42
Back to the equation:
-(21x+42)
-21x-42+189=0
We add all the numbers together, and all the variables
-21x+147=0
We move all terms containing x to the left, all other terms to the right
-21x=-147
x=-147/-21
x=+7
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