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y in (-oo:+oo)
y-((1/3)*y)-15 = 0
y+(-1/3)*y-15 = 0
2/3*y-15 = 0 // + 15
2/3*y = 15 // : 2/3
y = 15/2/3
y = 45/2
y = 45/2
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