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50x+40=30x+70
We move all terms to the left:
50x+40-(30x+70)=0
We get rid of parentheses
50x-30x-70+40=0
We add all the numbers together, and all the variables
20x-30=0
We move all terms containing x to the left, all other terms to the right
20x=30
x=30/20
x=1+1/2
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