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30x+12=28x+6
We move all terms to the left:
30x+12-(28x+6)=0
We get rid of parentheses
30x-28x-6+12=0
We add all the numbers together, and all the variables
2x+6=0
We move all terms containing x to the left, all other terms to the right
2x=-6
x=-6/2
x=-3
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