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X+0.8(80)=0.2(80+X)
We move all terms to the left:
X+0.8(80)-(0.2(80+X))=0
We add all the numbers together, and all the variables
X-(0.2(X+80))+0.880=0
We add all the numbers together, and all the variables
X-(0.2(X+80))+0.88=0
We calculate terms in parentheses: -(0.2(X+80)), so:We get rid of parentheses
0.2(X+80)
We multiply parentheses
0.2X+16
Back to the equation:
-(0.2X+16)
X-0.2X-16+0.88=0
We add all the numbers together, and all the variables
0.8X-15.12=0
We move all terms containing X to the left, all other terms to the right
0.8X=15.12
X=15.12/0.8
X=18+0.72/0.8
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