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k in (-oo:+oo)
2*(5*k+7) = 74 // - 74
2*(5*k+7)-74 = 0
2*(5*k+7)-74 = 0
10*k-60 = 0
10*k-60 = 0
10*k-60 = 0 // + 60
10*k = 60 // : 10
k = 60/10
k = 6
k = 6
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