Решите уравнения: а) 7х+13=-5х+25 б) х+5(2-4х)=29 в) 1/2х+1=-1/3(х+3/4)

Question

Решите уравнения:
а) 7х+13=-5х+25
б) х+5(2-4х)=29
в) 1/2х+1=-1/3(х+3/4)

Answer 1

7х+13=-5х+25;
7х+5х=25-13;
12х=12; х=1.


х+5(2-4х)=29;
х+10-20х=29;
-19х=19;
х=-1.

1/2х+1=-1/3(х+3/4);
1/2х+1=-1/3х-1/4;
1/2х+1/3х=-1/4-1;
5/6х=-5/4;
х=-5/4÷5/6;
х=-3/2; х=-1 1/2