Question

0,3*2/7+0,3*5/7=?
2х+3=0
6х-7=15+2х

Answer 1

3/35 + 3/14 = ( 12 + 30) / 140 = 42 / 140 =21/70 = 3/10 = 0,3

2x = - 3
x = - 3/2
x = - 1,5

6x - 2x = 7 + 15
4x = 22
x = 22/4
x = 5,5