105=b*15

Solution for 105=b*15 equation:

Simplifying
105 = b * 15

Reorder the terms for easier multiplication:
105 = 15b

Solving
105 = 15b

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '-15b' to each side of the equation.
105 + -15b = 15b + -15b

Combine like terms: 15b + -15b = 0
105 + -15b = 0

Add '-105' to each side of the equation.
105 + -105 + -15b = 0 + -105

Combine like terms: 105 + -105 = 0
0 + -15b = 0 + -105
-15b = 0 + -105

Combine like terms: 0 + -105 = -105
-15b = -105

Divide each side by '-15'.
b = 7

Simplifying
b = 7