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x-3...*3...-2x...=6 1...*3...-3x =15
-3...*3...-x=6 / :3 3...*...-3x = 15 /:3
-1...*... - x =2 ... - x = 15
-1...*...-2 = x 20-5=15 x=5
-1*...*...-2 =5
-1 * ...*...= 3
-1* (-3) * 1 = 3