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100=150x+25(1-x)
We move all terms to the left:
100-(150x+25(1-x))=0
We add all the numbers together, and all the variables
-(150x+25(-1x+1))+100=0
We calculate terms in parentheses: -(150x+25(-1x+1)), so:We get rid of parentheses
150x+25(-1x+1)
We multiply parentheses
150x-25x+25
We add all the numbers together, and all the variables
125x+25
Back to the equation:
-(125x+25)
-125x-25+100=0
We add all the numbers together, and all the variables
-125x+75=0
We move all terms containing x to the left, all other terms to the right
-125x=-75
x=-75/-125
x=3/5
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