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y in (-oo:+oo)
y-((3*y-(7/7))/(8/21))+(2/3)*y = 0
(-21/8)*(3*y-1)+y+(2/3)*y = 0
y-21/8*(3*y-1)+(2*y)/3 = 0
(-21/8*3*(3*y-1))/3+(3*y)/3+(2*y)/3 = 0
3*y-21/8*3*(3*y-1)+2*y = 0
2*y-165/8*y+63/8 = 0
63/8-149/8*y = 0
(63/8-149/8*y)/3 = 0
(63/8-149/8*y)/3 = 0 // * 3
63/8-149/8*y = 0
63/8-149/8*y = 0 // - 63/8
-149/8*y = -63/8 // : -149/8
y = -63/8/(-149/8)
y = 63/149
y = 63/149
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