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4x+3.500=15
We move all terms to the left:
4x+3.500-(15)=0
We add all the numbers together, and all the variables
4x-11.5=0
We move all terms containing x to the left, all other terms to the right
4x=11.5
x=11.5/4
x=2+2.3333333333333/2.6666666666667
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