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y in (-oo:+oo)
(-4/7)*(y-28)-((1/21)*y) = 0
(-4/7)*(y-28)+(-1/21)*y = 0
-4/7*(y-28)-y/21 = 0
(-4/7*21*(y-28))/21-y/21 = 0
-4/7*21*(y-28)-y = 0
336-13*y = 0
(336-13*y)/21 = 0
(336-13*y)/21 = 0 // * 21
336-13*y = 0
336-13*y = 0 // - 336
-13*y = -336 // : -13
y = -336/(-13)
y = 336/13
y = 336/13
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