решите уравнения (0,2х+0,4х)*3,5=6,3

(0,2х+0,4х)·3,5=6,3(2/10х+4/10х)·35/10=63/106/10х=63/10 : 35/10=63/10 · 10/35=63/35=9/5х=9/5 : 6/10=9/5 · 10/6=3/1 · 2/2=3·1=3