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y in (-oo:+oo)
6.4 = y/4 // - y/4
6.4-(y/4) = 0
6.4-1/4*y = 0 // - 6.4
-1/4*y = -6.4 // : -1/4
y = -6.4/(-1/4)
y = 25.6
y = 25.6
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