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40x-10=-30x+40
We move all terms to the left:
40x-10-(-30x+40)=0
We get rid of parentheses
40x+30x-40-10=0
We add all the numbers together, and all the variables
70x-50=0
We move all terms containing x to the left, all other terms to the right
70x=50
x=50/70
x=5/7
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