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q in (-oo:+oo)
(4/15)*q-(7/3) = 5 // - 5
(4/15)*q-(7/3)-5 = 0
(4/15)*q-7/3-5 = 0
4/15*q-22/3 = 0 // + 22/3
4/15*q = 22/3 // : 4/15
q = 22/3/4/15
q = 55/2
q = 55/2
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