A linear equation in three variable.
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15 and 24, respectively.
R = S + 2T S = 3T .... substitute R = (3T) + 2T R = 5T
r + s = 4 and 2r + 3s = 8 multiply the first equation by 2 giving 2r + 2s = 8 subtract this from the second equation giving s = 0 So r = 4 and s = 0.
s = -70
s = 20