Question

1)(5х-1)(2х+1)-10х*2=0,6

2)18х*2-(9х+2)(2х-1)=1

Answer 1

$10x^{2}-2x+5x-1-10x^{2}=0.6 \ 3x-1=0.6 \ 3x=1.6 \ x= frac{1.6}{3}= frac{8}{15}$
$18x^{2}-18x^{2}-4x+9x+2=0 \ 5x+2=0 \ 5x=-2 \ x=-0.4$