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-7.5x-3.5+4x=24.5
We move all terms to the left:
-7.5x-3.5+4x-(24.5)=0
We add all the numbers together, and all the variables
-3.5x-28=0
We move all terms containing x to the left, all other terms to the right
-3.5x=28
x=28/-3.5
x=-8
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