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228=-5x-7(3x+12)
We move all terms to the left:
228-(-5x-7(3x+12))=0
We calculate terms in parentheses: -(-5x-7(3x+12)), so:We get rid of parentheses
-5x-7(3x+12)
We multiply parentheses
-5x-21x-84
We add all the numbers together, and all the variables
-26x-84
Back to the equation:
-(-26x-84)
26x+84+228=0
We add all the numbers together, and all the variables
26x+312=0
We move all terms containing x to the left, all other terms to the right
26x=-312
x=-312/26
x=-12
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