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320=-87(7x-5)
We move all terms to the left:
320-(-87(7x-5))=0
We calculate terms in parentheses: -(-87(7x-5)), so:We get rid of parentheses
-87(7x-5)
We multiply parentheses
-609x+435
Back to the equation:
-(-609x+435)
609x-435+320=0
We add all the numbers together, and all the variables
609x-115=0
We move all terms containing x to the left, all other terms to the right
609x=115
x=115/609
x=115/609
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