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-2(x+40)=4(5-x)
We move all terms to the left:
-2(x+40)-(4(5-x))=0
We add all the numbers together, and all the variables
-2(x+40)-(4(-1x+5))=0
We multiply parentheses
-2x-(4(-1x+5))-80=0
We calculate terms in parentheses: -(4(-1x+5)), so:We get rid of parentheses
4(-1x+5)
We multiply parentheses
-4x+20
Back to the equation:
-(-4x+20)
-2x+4x-20-80=0
We add all the numbers together, and all the variables
2x-100=0
We move all terms containing x to the left, all other terms to the right
2x=100
x=100/2
x=50
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