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x in (-oo:+oo)
y = (50-(4*x))/8 // - (50-(4*x))/8
y-((50-(4*x))/8) = 0
y-((50-4*x)/8) = 0
(-1*(50-4*x))/8+y = 0
(-1*(50-4*x))/8+(8*y)/8 = 0
8*y-1*(50-4*x) = 0
4*x+8*y-50 = 0
(4*x+8*y-50)/8 = 0
(4*x+8*y-50)/8 = 0 // * 8
4*x+8*y-50 = 0
4*x+8*y-50 = 0 // - 8*y-50
4*x = -(8*y-50) // : 4
x = (-(8*y-50))/4
x = (50-(8*y))/4
x = (50-(8*y))/4
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