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10x+3x+0.5x=100
We move all terms to the left:
10x+3x+0.5x-(100)=0
We add all the numbers together, and all the variables
13.5x-100=0
We move all terms containing x to the left, all other terms to the right
13.5x=100
x=100/13.5
x=7+3.66666666667/9
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