Question

задание 3
решите плиз

Answer 1

0.4*(6n-7)=0.5*(3n+7)

2.4n-2.8=1.5n+3.5

2.4n-1.5n=2.8+3.5

0.9n=6.3

n=6.3/0.9

n=63/9

n=7