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q in (-oo:+oo)
(16-(3*5))*q+13 = (2*9-16)*q+12/12-1 // - (2*9-16)*q+12/12-1
(16-(3*5))*q-((2*9-16)*q)-(12/12)+1+13 = 0
(16-15)*q-((2*9-16)*q)-1+1+13 = 0
13-q = 0 // - 13
-q = -13 // * -1
q = 13
q = 13
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