Question

(3/4x-2/5)*20=4 решите

Answer 1

15х -8 = 4

15х = 8 +4

15х = 12

х = 12/15 =4/5

Answer 2

($(frac{3}{4}x-frac{2}{5})*20=4 \20*(frac{3x}{4}-frac{2}{5})=4 \20*frac{15x}{20}-frac{8}{20}=4 \ 20*frac{15x-8}{20}=4 \ 15x-8=4 \ 15x=4+8 \ 15x=12 \ x=frac{12}{15}=frac{4}{5} \ x=frac{4}{5}$