Question

9b+6b-15=615 17x-x+5x-19=170 решите уравнеие

Answer 1

9b+6b-15=615
15b-15=615
15b=615+15
b=630/15
b=42

17x-x+5x-19=170

21x=170+19

21x-189

x=189:21

x=9