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y in (-oo:+oo)
2*y-((10/3)*y)-15 = 0
2*y+(-10/3)*y-15 = 0
-4/3*y-15 = 0 // + 15
-4/3*y = 15 // : -4/3
y = 15/(-4/3)
y = -45/4
y = -45/4
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