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28=15-3x
We move all terms to the left:
28-(15-3x)=0
We add all the numbers together, and all the variables
-(-3x+15)+28=0
We get rid of parentheses
3x-15+28=0
We add all the numbers together, and all the variables
3x+13=0
We move all terms containing x to the left, all other terms to the right
3x=-13
x=-13/3
x=-4+1/3
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