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q in (-oo:+oo)
(7*(5-q))/5 = -2*q // + -2*q
(7*(5-q))/5-(-2*q) = 0
(7*(5-q))/5+2*q = 0
(7*(5-q))/5+(2*5*q)/5 = 0
7*(5-q)+2*5*q = 0
3*q+35 = 0
(3*q+35)/5 = 0
(3*q+35)/5 = 0 // * 5
3*q+35 = 0
3*q+35 = 0 // - 35
3*q = -35 // : 3
q = -35/3
q = -35/3
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