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-3x+28=5x-20
We move all terms to the left:
-3x+28-(5x-20)=0
We get rid of parentheses
-3x-5x+20+28=0
We add all the numbers together, and all the variables
-8x+48=0
We move all terms containing x to the left, all other terms to the right
-8x=-48
x=-48/-8
x=+6
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