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50x-10=40x+30
We move all terms to the left:
50x-10-(40x+30)=0
We get rid of parentheses
50x-40x-30-10=0
We add all the numbers together, and all the variables
10x-40=0
We move all terms containing x to the left, all other terms to the right
10x=40
x=40/10
x=4
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