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30x=x+40
We move all terms to the left:
30x-(x+40)=0
We get rid of parentheses
30x-x-40=0
We add all the numbers together, and all the variables
29x-40=0
We move all terms containing x to the left, all other terms to the right
29x=40
x=40/29
x=1+11/29
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