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10x-40+3x=2x+100-3x
We move all terms to the left:
10x-40+3x-(2x+100-3x)=0
We add all the numbers together, and all the variables
10x+3x-(-1x+100)-40=0
We add all the numbers together, and all the variables
13x-(-1x+100)-40=0
We get rid of parentheses
13x+1x-100-40=0
We add all the numbers together, and all the variables
14x-140=0
We move all terms containing x to the left, all other terms to the right
14x=140
x=140/14
x=10
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