Question

решите уровнение 15х+12=9+3х

Answer 1

15х+12-9-3х=0

12х+3=0

12х=-3

х=-3:12

х=-1/4

Answer 2

15х+12=9+3х
15х-3х=9-12
12х=-3
х=-3/12
х=-1/4
х=-0,25
15*(-0,25)+12=9+3*(-0,25)
         -3,75+12=9+(-0,75)
                 8,25=8,25