Question

а)3х+х+2=18;
б)3х-12=х;

Answer 1

а)3х+х+2=18; 4х=18-2; х=16:4; х=4; /// б)3х-12=х; 3х-х=12; 2х=12; х=12:2; х=6

Answer 2

а)
4х=16х
х=4
б)2х=12
х=6