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10x+100(32-x)=1390
We move all terms to the left:
10x+100(32-x)-(1390)=0
We add all the numbers together, and all the variables
10x+100(-1x+32)-1390=0
We multiply parentheses
10x-100x+3200-1390=0
We add all the numbers together, and all the variables
-90x+1810=0
We move all terms containing x to the left, all other terms to the right
-90x=-1810
x=-1810/-90
x=20+1/9
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