Question

как решить 4.2х+8.4=14/7

Answer 1

4,2х+8,4=2; 4,2х=2-8,4; 4,2х=-6,4; х=-6,4:4,2; х=-1,524

Answer 2

$4.2x+8.4= frac{14}{7} \ 4.2x+8.4=2\4.2x=2-8.4\4.2x=-6.4\x=-6.4:4.2\ \ \ - frac{6.4}{4.2} =- frac{64}{42} =- frac{32}{21} =-1 frac{11}{21}$