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231=7(18-3x)
We move all terms to the left:
231-(7(18-3x))=0
We add all the numbers together, and all the variables
-(7(-3x+18))+231=0
We calculate terms in parentheses: -(7(-3x+18)), so:We get rid of parentheses
7(-3x+18)
We multiply parentheses
-21x+126
Back to the equation:
-(-21x+126)
21x-126+231=0
We add all the numbers together, and all the variables
21x+105=0
We move all terms containing x to the left, all other terms to the right
21x=-105
x=-105/21
x=-5
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