d=3c
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it equals 4c
c = 6 and d = 7
It equals 10.5 A = 6 B = 8 which is 6+1/3 of 6 C = 10.5 which is 8+1/3 of 8
-8c + 1 = -3 => -8c = -3 + 1 => -8c = -2 => c = -2/(-8) => c = 1/4 = 0.25
It's algebra. A substitute for number. Ex: "x+y=z" could mean 1+2=3.