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x in (-oo:+oo)
50-x = (2*x+50)/4 // - (2*x+50)/4
50-((2*x+50)/4)-x = 0
(-1*(2*x+50))/4-x+50 = 0
(-1*(2*x+50))/4+(4*(-x))/4+(4*50)/4 = 0
4*(-x)-1*(2*x+50)+4*50 = 0
200-6*x-50 = 0
150-6*x = 0
(150-6*x)/4 = 0
(150-6*x)/4 = 0 // * 4
150-6*x = 0
150-6*x = 0 // - 150
-6*x = -150 // : -6
x = -150/(-6)
x = 25
x = 25
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