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It is -6x - 9
If you mean 6x+3-27+15 then it is an expression that can be simplified to: 6x-9
-6x+3 = -7-5x 7+3 = 6x-5x 10=x
x2 + 6x + 12 = 0 x2 + 6x + 9 = -3 (x + 3)2 = -3 x + 3 = ± √-3 x = -3 ± i√3
6x - 2 = 16 : 6x = 16 + 2 = 18 : x = 18÷ 6 = 3 :x - 3 = 3 - 3 = 0 : x - 3 = 0