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215=5(-7x+8)
We move all terms to the left:
215-(5(-7x+8))=0
We calculate terms in parentheses: -(5(-7x+8)), so:We get rid of parentheses
5(-7x+8)
We multiply parentheses
-35x+40
Back to the equation:
-(-35x+40)
35x-40+215=0
We add all the numbers together, and all the variables
35x+175=0
We move all terms containing x to the left, all other terms to the right
35x=-175
x=-175/35
x=-5
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