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y in (-oo:+oo)
10/40 = 7*y // - 7*y
10/40-(7*y) = 0
10/40-7*y = 0
1/4-7*y = 0 // - 1/4
-7*y = -1/4 // : -7
y = -1/4/(-7)
y = 1/28
y = 1/28
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