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5x+10(12-x)=100
We move all terms to the left:
5x+10(12-x)-(100)=0
We add all the numbers together, and all the variables
5x+10(-1x+12)-100=0
We multiply parentheses
5x-10x+120-100=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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