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x in (-oo:+oo)
x-((7.5*x)/100) = 617.05 // - 617.05
x-((7.5*x)/100)-617.05 = 0
x-0.075*x-617.05 = 0
0.925*x-617.05 = 0 // + 617.05
0.925*x = 617.05 // : 0.925
x = 617.05/0.925
x = 667.08108108
x = 667.08108108
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