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73=-4x+7(-2x+31)
We move all terms to the left:
73-(-4x+7(-2x+31))=0
We calculate terms in parentheses: -(-4x+7(-2x+31)), so:We get rid of parentheses
-4x+7(-2x+31)
We multiply parentheses
-4x-14x+217
We add all the numbers together, and all the variables
-18x+217
Back to the equation:
-(-18x+217)
18x-217+73=0
We add all the numbers together, and all the variables
18x-144=0
We move all terms containing x to the left, all other terms to the right
18x=144
x=144/18
x=8
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