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10x+12=13x+30
We move all terms to the left:
10x+12-(13x+30)=0
We get rid of parentheses
10x-13x-30+12=0
We add all the numbers together, and all the variables
-3x-18=0
We move all terms containing x to the left, all other terms to the right
-3x=18
x=18/-3
x=-6
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