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7.5x+4x=-23.5
We move all terms to the left:
7.5x+4x-(-23.5)=0
We add all the numbers together, and all the variables
11.5x+23.5=0
We move all terms containing x to the left, all other terms to the right
11.5x=-23.5
x=-23.5/11.5
x=-2+0.5/11.5
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