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680=8(-9x+22)
We move all terms to the left:
680-(8(-9x+22))=0
We calculate terms in parentheses: -(8(-9x+22)), so:We get rid of parentheses
8(-9x+22)
We multiply parentheses
-72x+176
Back to the equation:
-(-72x+176)
72x-176+680=0
We add all the numbers together, and all the variables
72x+504=0
We move all terms containing x to the left, all other terms to the right
72x=-504
x=-504/72
x=-7
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