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-7.5x+1.5=-28.5
We move all terms to the left:
-7.5x+1.5-(-28.5)=0
We add all the numbers together, and all the variables
-7.5x+30=0
We move all terms containing x to the left, all other terms to the right
-7.5x=-30
x=-30/-7.5
x=+4
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