Question

решите уравнения. 12х+15=5х-19 25-3b=9-5b

плиз!

Answer 1

12х+15=5х-19

12х-5х=-19-15

7х=-34

х=-34:7

х=-4 6/7

 

25-3b=9-5b

-3b+5b=9-25

2b=-16

b=-8