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40x+20=100+10x
We move all terms to the left:
40x+20-(100+10x)=0
We add all the numbers together, and all the variables
40x-(10x+100)+20=0
We get rid of parentheses
40x-10x-100+20=0
We add all the numbers together, and all the variables
30x-80=0
We move all terms containing x to the left, all other terms to the right
30x=80
x=80/30
x=2+2/3
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