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X=0.8(X+30)
We move all terms to the left:
X-(0.8(X+30))=0
We calculate terms in parentheses: -(0.8(X+30)), so:We get rid of parentheses
0.8(X+30)
We multiply parentheses
0.8X+24
Back to the equation:
-(0.8X+24)
X-0.8X-24=0
We add all the numbers together, and all the variables
0.2X-24=0
We move all terms containing X to the left, all other terms to the right
0.2X=24
X=24/0.2
X=120
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