Simplify: 5(3m + 4 - n) + 20 - m - 2n
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5(3m+4-n)+20-m-2n
15m+20-5n+20-m-2n
15m-m-5n-2n+20+20
14m-7n+40
15m+20-5n+20-m-2n
15m-m-5n-2n+20+20
14m-7n+40
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