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Anonymous
30+30+30+30+30 = 5 or as 3+3/3+3/3 = 5
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5 of them with a remainder of 1
5-5+5-5+5 equal to 5
You have to combine equal terms. -5r-9s+9r+3s-6 = -5r+9r-9s+3s-6 = 4r-6s-6
4=4(3s) 4=12s s= 1/3
5 - 5 + 5 - 5 + 5 = 5