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y in (-oo:+oo)
(-2/7)*(y-21)-((1/14)*y) = 0
(-2/7)*(y-21)+(-1/14)*y = 0
-2/7*(y-21)-y/14 = 0
(-2/7*14*(y-21))/14-y/14 = 0
-2/7*14*(y-21)-y = 0
84-5*y = 0
(84-5*y)/14 = 0
(84-5*y)/14 = 0 // * 14
84-5*y = 0
84-5*y = 0 // - 84
-5*y = -84 // : -5
y = -84/(-5)
y = 84/5
y = 84/5
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