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150x = 35 (mod 31) => 30x = 7 (mod 31)
Use the fact that if x = a (mod k), y = b (mod k), then xy = ab (mod k)
26*x = 4 (mod 31)
(31-5)*x = 4 (mod 31)
150 (mod 31) = 26
Updated
150x = 35 (mod 31) => 30x = 7 (mod 31)
Use the fact that if x = a (mod k), y = b (mod k), then xy = ab (mod k)
26*x = 4 (mod 31)
(31-5)*x = 4 (mod 31)
150 (mod 31) = 26
Updated