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x=0.4(100.000+x)
We move all terms to the left:
x-(0.4(100.000+x))=0
We add all the numbers together, and all the variables
x-(0.4(x+100))=0
We calculate terms in parentheses: -(0.4(x+100)), so:We get rid of parentheses
0.4(x+100)
We multiply parentheses
0.4x+40
Back to the equation:
-(0.4x+40)
x-0.4x-40=0
We add all the numbers together, and all the variables
0.6x-40=0
We move all terms containing x to the left, all other terms to the right
0.6x=40
x=40/0.6
x=66+0.4/0.6
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