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200.16+30.15x=320.76
We move all terms to the left:
200.16+30.15x-(320.76)=0
We add all the numbers together, and all the variables
30.15x-120.6=0
We move all terms containing x to the left, all other terms to the right
30.15x=120.6
x=120.6/30.15
x=4
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