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k in (-oo:+oo)
7*k+(5/7)*k-10 = -13/4 // + -13/4
7*k+(5/7)*k-(-13/4)-10 = 0
7*k+(5/7)*k+13/4-10 = 0
54/7*k-27/4 = 0 // + 27/4
54/7*k = 27/4 // : 54/7
k = 27/4/54/7
k = 7/8
k = 7/8
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