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28=8x+12+7x
We move all terms to the left:
28-(8x+12+7x)=0
We add all the numbers together, and all the variables
-(15x+12)+28=0
We get rid of parentheses
-15x-12+28=0
We add all the numbers together, and all the variables
-15x+16=0
We move all terms containing x to the left, all other terms to the right
-15x=-16
x=-16/-15
x=1+1/15
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