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15.7x-5.7x=63.9
We move all terms to the left:
15.7x-5.7x-(63.9)=0
We add all the numbers together, and all the variables
10x-63.9=0
We move all terms containing x to the left, all other terms to the right
10x=63.9
x=63.9/10
x=6+2.0526315789474/5.2631578947368
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