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q in (-oo:+oo)
7*q-(2/3) = 4 // - 4
7*q-(2/3)-4 = 0
7*q-2/3-4 = 0
7*q-14/3 = 0 // + 14/3
7*q = 14/3 // : 7
q = 14/3/7
q = 2/3
q = 2/3
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