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y in (-oo:+oo)
5-((2/3)*y) = 15 // - 15
5-((2/3)*y)-15 = 0
(-2/3)*y-15+5 = 0
-2/3*y-10 = 0 // + 10
-2/3*y = 10 // : -2/3
y = 10/(-2/3)
y = -15
y = -15
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