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15x=314.85
We move all terms to the left:
15x-(314.85)=0
We add all the numbers together, and all the variables
15x-314.85=0
We move all terms containing x to the left, all other terms to the right
15x=314.85
x=314.85/15
x=20+8.02702702703/8.10810810811
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