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2x+12-5x=-28.5
We move all terms to the left:
2x+12-5x-(-28.5)=0
We add all the numbers together, and all the variables
-3x+40.5=0
We move all terms containing x to the left, all other terms to the right
-3x=-40.5
x=-40.5/-3
x=13+1/2
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