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10x+12=5x+42
We move all terms to the left:
10x+12-(5x+42)=0
We get rid of parentheses
10x-5x-42+12=0
We add all the numbers together, and all the variables
5x-30=0
We move all terms containing x to the left, all other terms to the right
5x=30
x=30/5
x=6
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