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8x+3.2x=100
We move all terms to the left:
8x+3.2x-(100)=0
We add all the numbers together, and all the variables
11.2x-100=0
We move all terms containing x to the left, all other terms to the right
11.2x=100
x=100/11.2
x=8+7.4285714285714/8
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