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y in (-oo:+oo)
(1/7)*(y-8)+7/8 = y+1/8 // - y+1/8
(1/7)*(y-8)-y+7/8-(1/8) = 0
(1/7)*(y-8)-y+7/8-1/8 = 0
1/7*(y-8)-y+7/8-1/8 = 0
(1/7*8*(y-8))/8+(8*(-y))/8+7/8-1/8 = 0
1/7*8*(y-8)+8*(-y)-1+7 = 0
7-48/7*y-64/7-1 = 0
-48/7*y-15/7-1 = 0
-48/7*y-22/7 = 0
(-48/7*y-22/7)/8 = 0
(-48/7*y-22/7)/8 = 0 // * 8
-48/7*y-22/7 = 0
-48/7*y-22/7 = 0 // + 22/7
-48/7*y = 22/7 // : -48/7
y = 22/7/(-48/7)
y = -11/24
y = -11/24
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