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y in (-oo:+oo)
(-2/7)*(y-35)-((1/21)*y) = 0
(-2/7)*(y-35)+(-1/21)*y = 0
-2/7*(y-35)-y/21 = 0
(-2/7*21*(y-35))/21-y/21 = 0
-2/7*21*(y-35)-y = 0
210-7*y = 0
(210-7*y)/21 = 0
(210-7*y)/21 = 0 // * 21
210-7*y = 0
210-7*y = 0 // - 210
-7*y = -210 // : -7
y = -210/(-7)
y = 30
y = 30
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