4y + 9The variable is Y. The variable is the letter (the unknown amount)
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It is a binomial expression with one variable, m.
5x-4y+9y+x-9+7 = 5x + x - 4y + 9y - 9 + 7 = 6x + 5y - 2 ■
4y-9 = 15 4y = 15+9 4y = 24 y = 6
s + 9
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