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4x+4.5=-12.8
We move all terms to the left:
4x+4.5-(-12.8)=0
We add all the numbers together, and all the variables
4x+17.3=0
We move all terms containing x to the left, all other terms to the right
4x=-17.3
x=-17.3/4
x=-4+1/3.0769230769231
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