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150x=100(4-x)
We move all terms to the left:
150x-(100(4-x))=0
We add all the numbers together, and all the variables
150x-(100(-1x+4))=0
We calculate terms in parentheses: -(100(-1x+4)), so:We get rid of parentheses
100(-1x+4)
We multiply parentheses
-100x+400
Back to the equation:
-(-100x+400)
150x+100x-400=0
We add all the numbers together, and all the variables
250x-400=0
We move all terms containing x to the left, all other terms to the right
250x=400
x=400/250
x=1+3/5
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