4/5x+18.6- 2.4x=17
4+93x-12x^2-85x=0
12x^2-8x-4=0
D=64-4×12×(-4)=256
x1= 8-16/24= -8/24=-1/3
x2=8+16/24/=1
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4/5x+18.6- 2.4x=17
4+93x-12x^2-85x=0
12x^2-8x-4=0
D=64-4×12×(-4)=256
x1= 8-16/24= -8/24=-1/3
x2=8+16/24/=1