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y in (-oo:+oo)
(-2/7)*(y-28)-((1/21)*y) = 0
(-2/7)*(y-28)+(-1/21)*y = 0
-2/7*(y-28)-y/21 = 0
(-2/7*21*(y-28))/21-y/21 = 0
-2/7*21*(y-28)-y = 0
168-7*y = 0
(168-7*y)/21 = 0
(168-7*y)/21 = 0 // * 21
168-7*y = 0
168-7*y = 0 // - 168
-7*y = -168 // : -7
y = -168/(-7)
y = 24
y = 24
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