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12.50+9.50x=90
We move all terms to the left:
12.50+9.50x-(90)=0
We add all the numbers together, and all the variables
9.50x-77.5=0
We move all terms containing x to the left, all other terms to the right
9.50x=77.5
x=77.5/9.50
x=8+1/6.3333333333333
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