Bjr
E = (5-3x)(2x+6)-(-12x²+3x-1)
E = 10x+30-6x²-18x-(-12x²+3x-1)
E = 10x+30-6x²-18x+12x²-3x+1
E = -11x+30-6x²+12x²+1
E = -11x+31-6x²+12x²
E = -11x+31+6x²
E = 6x²-11x+31
Voilà !
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Bjr
E = (5-3x)(2x+6)-(-12x²+3x-1)
E = 10x+30-6x²-18x-(-12x²+3x-1)
E = 10x+30-6x²-18x+12x²-3x+1
E = -11x+30-6x²+12x²+1
E = -11x+31-6x²+12x²
E = -11x+31+6x²
E = 6x²-11x+31
Voilà !