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k in (-oo:+oo)
7*(5*k+9) = 203 // - 203
7*(5*k+9)-203 = 0
7*(5*k+9)-203 = 0
35*k-140 = 0
35*k-140 = 0
35*k-140 = 0 // + 140
35*k = 140 // : 35
k = 140/35
k = 4
k = 4
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