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x in (-oo:+oo)
(1/8)*(x+y) = 11 // - 11
(1/8)*(x+y)-11 = 0
1/8*(x+y)-11 = 0
1/8*(x+y)-11 = 0
1/8*x+1/8*y-11 = 0
1/8*x+1/8*y-11 = 0
1/8*x+1/8*y-11 = 0 // - 1/8*y-11
1/8*x = -(1/8*y-11) // : 1/8
x = (-(1/8*y-11))/1/8
x = 8*(11-(1/8*y))
x = 8*(11-(1/8*y))
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