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10-7x=13x-30
We move all terms to the left:
10-7x-(13x-30)=0
We get rid of parentheses
-7x-13x+30+10=0
We add all the numbers together, and all the variables
-20x+40=0
We move all terms containing x to the left, all other terms to the right
-20x=-40
x=-40/-20
x=+2
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