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y in (-oo:+oo)
4/21 = y/84 // - y/84
4/21-(y/84) = 0
4/21-1/84*y = 0 // - 4/21
-1/84*y = -4/21 // : -1/84
y = -4/21/(-1/84)
y = 16
y = 16
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