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7.50+2.15x=20
We move all terms to the left:
7.50+2.15x-(20)=0
We add all the numbers together, and all the variables
2.15x-12.5=0
We move all terms containing x to the left, all other terms to the right
2.15x=12.5
x=12.5/2.15
x=5+1/1.2285714285714
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