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y in (-oo:+oo)
15*(3/5)-((2/9)*y) = -13 // + 13
15*(3/5)-((2/9)*y)+13 = 0
(-2/9)*y+15*(3/5)+13 = 0
22-2/9*y = 0 // - 22
-2/9*y = -22 // : -2/9
y = -22/(-2/9)
y = 99
y = 99
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