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10.8x-2.1x=139.20
We move all terms to the left:
10.8x-2.1x-(139.20)=0
We add all the numbers together, and all the variables
10.8x-2.1x-(139.2)=0
We add all the numbers together, and all the variables
8.7x-139.2=0
We move all terms containing x to the left, all other terms to the right
8.7x=139.2
x=139.2/8.7
x=16
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