Question

How you solve b-9+6b=30

Answer 1

b - 9 + 6b = 30

b+ 6b - 9 = 30 

7b - 9 = 30

7b = 39

b = $\frac{39}{7}$

Nice days...........

Answer 2

associative property is moving a+b=b+a
add like terms
1b+6b-9=30
7b-9=30
add 9 to both sides
7b=39
divide both sides by 7
b=39/7
39/7=5 and 4/7