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x=40x-100-10x
We move all terms to the left:
x-(40x-100-10x)=0
We add all the numbers together, and all the variables
x-(30x-100)=0
We get rid of parentheses
x-30x+100=0
We add all the numbers together, and all the variables
-29x+100=0
We move all terms containing x to the left, all other terms to the right
-29x=-100
x=-100/-29
x=3+13/29
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