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q in (-oo:+oo)
144 = (9*(2*q+12))/2 // - (9*(2*q+12))/2
144-((9*(2*q+12))/2) = 0
(-9/2)*(2*q+12)+144 = 0
144-9/2*(2*q+12) = 0
144-9/2*(2*q+12) = 0
90-9*q = 0
90-9*q = 0
90-9*q = 0 // - 90
-9*q = -90 // : -9
q = -90/(-9)
q = 10
q = 10
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