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504=6(-7x+14)
We move all terms to the left:
504-(6(-7x+14))=0
We calculate terms in parentheses: -(6(-7x+14)), so:We get rid of parentheses
6(-7x+14)
We multiply parentheses
-42x+84
Back to the equation:
-(-42x+84)
42x-84+504=0
We add all the numbers together, and all the variables
42x+420=0
We move all terms containing x to the left, all other terms to the right
42x=-420
x=-420/42
x=-10
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