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49=-4x+7(-x+18)
We move all terms to the left:
49-(-4x+7(-x+18))=0
We add all the numbers together, and all the variables
-(-4x+7(-1x+18))+49=0
We calculate terms in parentheses: -(-4x+7(-1x+18)), so:We get rid of parentheses
-4x+7(-1x+18)
We multiply parentheses
-4x-7x+126
We add all the numbers together, and all the variables
-11x+126
Back to the equation:
-(-11x+126)
11x-126+49=0
We add all the numbers together, and all the variables
11x-77=0
We move all terms containing x to the left, all other terms to the right
11x=77
x=77/11
x=7
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