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11x+12=5x+42
We move all terms to the left:
11x+12-(5x+42)=0
We get rid of parentheses
11x-5x-42+12=0
We add all the numbers together, and all the variables
6x-30=0
We move all terms containing x to the left, all other terms to the right
6x=30
x=30/6
x=5
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