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k in (-oo:+oo)
(4/7)*k+1/10 = -39/10 // + -39/10
(4/7)*k+1/10-(-39/10) = 0
(4/7)*k+1/10+39/10 = 0
4/7*k+4 = 0 // - 4
4/7*k = -4 // : 4/7
k = -4/4/7
k = -7
k = -7
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