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y in (-oo:+oo)
(-4/7)*(y-35)-((1/21)*y) = 0
(-4/7)*(y-35)+(-1/21)*y = 0
-4/7*(y-35)-y/21 = 0
(-4/7*21*(y-35))/21-y/21 = 0
-4/7*21*(y-35)-y = 0
420-13*y = 0
(420-13*y)/21 = 0
(420-13*y)/21 = 0 // * 21
420-13*y = 0
420-13*y = 0 // - 420
-13*y = -420 // : -13
y = -420/(-13)
y = 420/13
y = 420/13
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