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y in (-oo:+oo)
15 = (-3/4)*y // - (-3/4)*y
15-((-3/4)*y) = 0
(3/4)*y+15 = 0
3/4*y+15 = 0 // - 15
3/4*y = -15 // : 3/4
y = -15/3/4
y = -20
y = -20
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