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y in (-oo:+oo)
6*y-((18/5)*y)-15 = 0
6*y+(-18/5)*y-15 = 0
12/5*y-15 = 0 // + 15
12/5*y = 15 // : 12/5
y = 15/12/5
y = 25/4
y = 25/4
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