Question

9*(x-5)+4*(6-x)=3+3*(x+20)-2x найти корень

Answer 1

9(х-5) + 4(6-х) = 3 + 3(х+20) - 2х
9х-45+24-4х = 3+3х+60-2х
9х-4х-3х+2х = 3+60+45-24
4х = 84
х= 84/4
х= 21