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13=-2(x-4)=3x
We move all terms to the left:
13-(-2(x-4))=0
We calculate terms in parentheses: -(-2(x-4)), so:We get rid of parentheses
-2(x-4)
We multiply parentheses
-2x+8
Back to the equation:
-(-2x+8)
2x-8+13=0
We add all the numbers together, and all the variables
2x+5=0
We move all terms containing x to the left, all other terms to the right
2x=-5
x=-5/2
x=-2+1/2
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