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x=40+10x
We move all terms to the left:
x-(40+10x)=0
We add all the numbers together, and all the variables
x-(10x+40)=0
We get rid of parentheses
x-10x-40=0
We add all the numbers together, and all the variables
-9x-40=0
We move all terms containing x to the left, all other terms to the right
-9x=40
x=40/-9
x=-4+4/9
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