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y in (-oo:+oo)
(-1/6)*y-y+4/7 = (1/42)*(y-8) // - (1/42)*(y-8)
(-1/6)*y-((1/42)*(y-8))-y+4/7 = 0
(-1/42)*(y-8)+(-1/6)*y-y+4/7 = 0
4/7-1/42*(y-8)-y/6-y = 0
(-1/42*6*7*(y-8))/(6*7)+(7*(-y))/(6*7)+(6*7*(-y))/(6*7)+(4*6)/(6*7) = 0
7*(-y)-1/42*6*7*(y-8)+6*7*(-y)+4*6 = 0
8-8*y-42*y+24 = 0
8-50*y+24 = 0
32-50*y = 0
(32-50*y)/(6*7) = 0
(32-50*y)/(6*7) = 0 // * 6*7
32-50*y = 0
32-50*y = 0 // - 32
-50*y = -32 // : -50
y = -32/(-50)
y = 16/25
y = 16/25
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