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k in (-oo:+oo)
5*(3*k+10) = -130 // + 130
5*(3*k+10)+130 = 0
5*(3*k+10)+130 = 0
15*k+180 = 0
15*k+180 = 0
15*k+180 = 0 // - 180
15*k = -180 // : 15
k = -180/15
k = -12
k = -12
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