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7x-28=+5x+12=
We move all terms to the left:
7x-28-(+5x+12)=0
We add all the numbers together, and all the variables
7x-(5x+12)-28=0
We get rid of parentheses
7x-5x-12-28=0
We add all the numbers together, and all the variables
2x-40=0
We move all terms containing x to the left, all other terms to the right
2x=40
x=40/2
x=20
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