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40x+12=30x+14
We move all terms to the left:
40x+12-(30x+14)=0
We get rid of parentheses
40x-30x-14+12=0
We add all the numbers together, and all the variables
10x-2=0
We move all terms containing x to the left, all other terms to the right
10x=2
x=2/10
x=1/5
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