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7x+30=8x+13
We move all terms to the left:
7x+30-(8x+13)=0
We get rid of parentheses
7x-8x-13+30=0
We add all the numbers together, and all the variables
-1x+17=0
We move all terms containing x to the left, all other terms to the right
-x=-17
x=-17/-1
x=+17
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