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x in (-oo:+oo)
(21*x)/100-((9*x)/100) = 922.8 // - 922.8
(21*x)/100-((9*x)/100)-922.8 = 0
(21*x)/100+(-9/100)*x-922.8 = 0
3/25*x-922.8 = 0 // + 922.8
3/25*x = 922.8 // : 3/25
x = 922.8/3/25
x = 7690
x = 7690
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