\(2,3x^2-4x-6x+8=3x^2-27x-3\\ \Rightarrow3x^2-10x+8-3x^2+27x+3=0\\ \Rightarrow37x+11=0\\ \Rightarrow x=-\dfrac{11}{37}\\ ----------\\ 4,5x^2-15x=5x^2-10x-x+2-5\\ \Rightarrow5x^2-15x-5x^2+11x-2=0\\ \Rightarrow-4x=2\\ \Rightarrow x=-\dfrac{1}{2}\\ ----------\\ 6,6\left(x^2-3x-4x+12\right)-6x^2+12x-4=0\\ \Rightarrow6x^2-42x+72-6x^2+12x-4=0\\ \Rightarrow-30x+68=0\\\Rightarrow x=\dfrac{34}{15} \)
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