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25-13=2(x-4)
We move all terms to the left:
25-13-(2(x-4))=0
We add all the numbers together, and all the variables
-(2(x-4))+12=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+12=0
We add all the numbers together, and all the variables
-2x+20=0
We move all terms containing x to the left, all other terms to the right
-2x=-20
x=-20/-2
x=+10
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