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(4*x+2*y)/100 = 360 // - 360
(4*x+2*y)/100-360 = 0
(4*x+2*y)/100+(-360*100)/100 = 0
4*x+2*y-360*100 = 0
4*x+2*y-36000 = 0
(4*x+2*y-36000)/100 = 0
(4*x+2*y-36000)/100 = 0 // * 100
4*x+2*y-36000 = 0
4*x+2*y-36000 = 0 // - 2*y-36000
4*x = -(2*y-36000) // : 4
x = (-(2*y-36000))/4
x = (36000-(2*y))/4
x = (36000-(2*y))/4
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