(7 + 8)/3 = t
Therefore, t = 5.
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To find this: You know (B+C) = 7. Therefore you know (A+A )= 21 - (B+C). Therefore 21-7 = 14. So now you know (A+A) = 14. So you divide (A+A)/2. This equals 7. Therefore A = 7.
It equals 24.
89
x/(-4) + 9 = 7 Therefore, x/(-4) = -2 Therefore, x = 8
a - 3 + 17 = 10 Therefore, a - 3 = -7 a = -4