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k in (-oo:+oo)
(3/4)*k-2/5 = -((-3/7)*k)-2 // + -((-3/7)*k)-2
(3/4)*k+(-3/7)*k-2/5+2 = 0
9/28*k+8/5 = 0 // - 8/5
9/28*k = -8/5 // : 9/28
k = -8/5/9/28
k = -224/45
k = -224/45
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