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y in (-oo:+oo)
(-3/4)*y = -9/20 // + -9/20
(-3/4)*y-(-9/20) = 0
(-3/4)*y+9/20 = 0
9/20-3/4*y = 0 // - 9/20
-3/4*y = -9/20 // : -3/4
y = -9/20/(-3/4)
y = 3/5
y = 3/5
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