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y in (-oo:+oo)
y-((2*y)/5)-(y/3) = 28 // - 28
y-((2*y)/5)-(y/3)-28 = 0
y+(-2/5)*y-(y/3)-28 = 0
4/15*y-28 = 0 // + 28
4/15*y = 28 // : 4/15
y = 28/4/15
y = 105
y = 105
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