0
Anonymous
15 + 10 - 13 - 5 = 7
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-15
15
12t + 15
-3 + -12 = -15
5y - 4 + 9y - 1y + 15= 5y + 9y - 1y + 15 - 4= (5 + 9 - 1)y + (15 - 4)= 13y + 9