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20+0.15x=31.25
We move all terms to the left:
20+0.15x-(31.25)=0
We add all the numbers together, and all the variables
0.15x-11.25=0
We move all terms containing x to the left, all other terms to the right
0.15x=11.25
x=11.25/0.15
x=75
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