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y in (-oo:+oo)
(-2/3)*y-((1/5)/6) = 7.5-3*y // - 7.5-3*y
(-2/3)*y-(-3*y)-((1/5)/6)-7.5 = 0
(-2/3)*y+3*y-1/30-7.5 = 0
7/3*y-7.53333333 = 0 // + 7.53333333
7/3*y = 7.53333333 // : 7/3
y = 7.53333333/7/3
y = 3.22857143
y = 3.22857143
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