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y in (-oo:+oo)
(-4/7)*y = 15/15 // - 15/15
(-4/7)*y-(15/15) = 0
(-4/7)*y-1 = 0
-4/7*y-1 = 0 // + 1
-4/7*y = 1 // : -4/7
y = 1/(-4/7)
y = -7/4
y = -7/4
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