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5m3 + 4n is an algebraic expression.
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It is an expression that can be simplified to -4n-1
2(15-2n) Look for the greatest common factor of 30 and -4n. Put it out front, then divide each term by this number to get the expression in the parentheses. 30/2 = 15, -4n/2 = -2n.
" 3x + 5 " does.