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y in (-oo:+oo)
(-2/7)*(y-28)-((1/14)*y) = 0
(-2/7)*(y-28)+(-1/14)*y = 0
-2/7*(y-28)-y/14 = 0
(-2/7*14*(y-28))/14-y/14 = 0
-2/7*14*(y-28)-y = 0
112-5*y = 0
(112-5*y)/14 = 0
(112-5*y)/14 = 0 // * 14
112-5*y = 0
112-5*y = 0 // - 112
-5*y = -112 // : -5
y = -112/(-5)
y = 112/5
y = 112/5
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