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12x²+15x-4x-5=8x²-4x+10x-5
12x²+11x-5=8x²+6x-5
12x²+11x-5-8x²-6x+5=0
4x²+5x=0
x(4x+5)=0
x=0
4x+5=0
4x=-5
x=-5/4