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78=6(-2x+5)
We move all terms to the left:
78-(6(-2x+5))=0
We calculate terms in parentheses: -(6(-2x+5)), so:We get rid of parentheses
6(-2x+5)
We multiply parentheses
-12x+30
Back to the equation:
-(-12x+30)
12x-30+78=0
We add all the numbers together, and all the variables
12x+48=0
We move all terms containing x to the left, all other terms to the right
12x=-48
x=-48/12
x=-4
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