(m-1)(5m+3n-7)-(m+4)(n+3-2m) how to solve
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(m(5m+3n-7)-1(5m+3n-7))-((m(n+3-2m)+4(n+3-2m)
5m²+3mn-7m-5m-3n+7-mn-3m+2m²-4n-12+8m
7m²-7m-7n+2mn-5
5m²+3mn-7m-5m-3n+7-mn-3m+2m²-4n-12+8m
7m²-7m-7n+2mn-5
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