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78=-2(2x-5)
We move all terms to the left:
78-(-2(2x-5))=0
We calculate terms in parentheses: -(-2(2x-5)), so:We get rid of parentheses
-2(2x-5)
We multiply parentheses
-4x+10
Back to the equation:
-(-4x+10)
4x-10+78=0
We add all the numbers together, and all the variables
4x+68=0
We move all terms containing x to the left, all other terms to the right
4x=-68
x=-68/4
x=-17
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