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(40*x+260)/25 = 56.25 // - 56.25
(40*x+260)/25-56.25 = 0
(40*x+260)/25+(-56.25*25)/25 = 0
40*x-56.25*25+260 = 0
40*x-1146.25 = 0
(40*x-1146.25)/25 = 0
(40*x-1146.25)/25 = 0 // * 25
40*x-1146.25 = 0
40*x-1146.25 = 0 // + 1146.25
40*x = 1146.25 // : 40
x = 1146.25/40
x = 28.65625
x = 28.65625
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