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y in (-oo:+oo)
(-3/7)*(y-28)-((1/14)*y) = 0
(-3/7)*(y-28)+(-1/14)*y = 0
-3/7*(y-28)-y/14 = 0
(-3/7*14*(y-28))/14-y/14 = 0
-3/7*14*(y-28)-y = 0
168-7*y = 0
(168-7*y)/14 = 0
(168-7*y)/14 = 0 // * 14
168-7*y = 0
168-7*y = 0 // - 168
-7*y = -168 // : -7
y = -168/(-7)
y = 24
y = 24
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