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100=10(x-70)+50
We move all terms to the left:
100-(10(x-70)+50)=0
We calculate terms in parentheses: -(10(x-70)+50), so:We get rid of parentheses
10(x-70)+50
We multiply parentheses
10x-700+50
We add all the numbers together, and all the variables
10x-650
Back to the equation:
-(10x-650)
-10x+650+100=0
We add all the numbers together, and all the variables
-10x+750=0
We move all terms containing x to the left, all other terms to the right
-10x=-750
x=-750/-10
x=+75
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