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k in (-oo:+oo)
-53/70 = 3*k+(6/7)*k+1/10 // - 3*k+(6/7)*k+1/10
-(3*k)-((6/7)*k)-53/70-(1/10) = 0
(-6/7)*k-3*k-53/70-1/10 = 0
-27/7*k-6/7 = 0 // + 6/7
-27/7*k = 6/7 // : -27/7
k = 6/7/(-27/7)
k = -2/9
k = -2/9
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