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7=d
d=3 so 7 goes by 3+d = c
C=cost and so it equals 10+1902 =1912
(7 x 7) - (5 x 3)
c = 6 and d = 7
That's the equation.
Commutativity.
-6
12
add 4 to each side: c + 7 = d so d is greater than c by 7.
7 equals down in sewer water
d=17
4
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7 days of the week