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7x=-3(x-10)
We move all terms to the left:
7x-(-3(x-10))=0
We calculate terms in parentheses: -(-3(x-10)), so:We get rid of parentheses
-3(x-10)
We multiply parentheses
-3x+30
Back to the equation:
-(-3x+30)
7x+3x-30=0
We add all the numbers together, and all the variables
10x-30=0
We move all terms containing x to the left, all other terms to the right
10x=30
x=30/10
x=3
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