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k in (-oo:+oo)
-(7*k)-3 = -73 // + 73
73-(7*k)-3 = 0
73-7*k-3 = 0
70-7*k = 0 // - 70
-7*k = -70 // : -7
k = -70/(-7)
k = 10
k = 10
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