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y in (-oo:+oo)
(y-15)/13 = -12/17 // + -12/17
(y-15)/13-(-12/17) = 0
(y-15)/13+12/17 = 0
(17*(y-15))/(13*17)+(12*13)/(13*17) = 0
17*(y-15)+12*13 = 0
17*y-99 = 0
(17*y-99)/(13*17) = 0
(17*y-99)/(13*17) = 0 // * 13*17
17*y-99 = 0
17*y-99 = 0 // + 99
17*y = 99 // : 17
y = 99/17
y = 99/17
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