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y in (-oo:+oo)
(-8/7)*(y-21)-((1/14)*y) = 0
(-8/7)*(y-21)+(-1/14)*y = 0
-8/7*(y-21)-y/14 = 0
(-8/7*14*(y-21))/14-y/14 = 0
-8/7*14*(y-21)-y = 0
336-17*y = 0
(336-17*y)/14 = 0
(336-17*y)/14 = 0 // * 14
336-17*y = 0
336-17*y = 0 // - 336
-17*y = -336 // : -17
y = -336/(-17)
y = 336/17
y = 336/17
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