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y in (-oo:+oo)
(-4/7)*(y-14)-((1/21)*y) = 0
(-4/7)*(y-14)+(-1/21)*y = 0
-4/7*(y-14)-y/21 = 0
(-4/7*21*(y-14))/21-y/21 = 0
-4/7*21*(y-14)-y = 0
168-13*y = 0
(168-13*y)/21 = 0
(168-13*y)/21 = 0 // * 21
168-13*y = 0
168-13*y = 0 // - 168
-13*y = -168 // : -13
y = -168/(-13)
y = 168/13
y = 168/13
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