Предмет: Математика, автор: KathyKate

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

плиз!

Ответы

Автор ответа: marusya86

0

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

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