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x - 6k = $29.6 l
l Resta
x - 10k = -$4 l
x - x - 6k - (-10k) = $29.6 - $4
-6k + 10k = $33.6
4k = $33.6
k = $8.4
x - 10k = -$4
x - 10($8.4) = -$4
x - $84 = -$4
x = -$4 + $84
x = $80