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4+x=2(mod5)
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add x both sides xx get 1+4+x=1+2 xxx 5 xxxx 5+x=3 mod x since 5=0 xxx 5 xxx mod x
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4+x=2(mod5) thus 4+x xx x x -4 xxxxxx thus x = xx (mod5). xx know xxxx x = 5(mod5) xxxx x+0 x xxxx xxxxxx xxxx x x xxxxxxx xxxx x = 3 x 5k with k belongs to Z