mn - 4m - 5n + 20
= m(n - 4) - 5(n - 4)
= (n - 4)(m - 5)
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(m - 5)(n - 4)
6m + 5n - 4m + 7n = 2m + 12n
It is simply: 5n+20 which is an algebraic expression because it has no equality sign
In the equation 5n-11=4n+20, n is equal to 31.
Previous poster was very wrong, 5n-3=17 5n=20 n=4