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x in (-oo:+oo)
0.1*x-(900*((50000-x)/50000)) = 0
(-9/500)*(50000-x)+0.1*x = 0
0.1*x-9/500*(50000-x) = 0
0.1*x-9/500*(50000-x) = 0
0.118*x-900 = 0
0.118*x-900 = 0
0.118*x-900 = 0 // + 900
0.118*x = 900 // : 0.118
x = 900/0.118
x = 7627.11864407
x = 7627.11864407
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