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28=8x+12=7x
We move all terms to the left:
28-(8x+12)=0
We get rid of parentheses
-8x-12+28=0
We add all the numbers together, and all the variables
-8x+16=0
We move all terms containing x to the left, all other terms to the right
-8x=-16
x=-16/-8
x=+2
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