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6x-12=4x+45
We move all terms to the left:
6x-12-(4x+45)=0
We get rid of parentheses
6x-4x-45-12=0
We add all the numbers together, and all the variables
2x-57=0
We move all terms containing x to the left, all other terms to the right
2x=57
x=57/2
x=28+1/2
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