6=-3(5)+b

Solution for 6=-3(5)+b equation:

Simplifying
6 = -3(5) + b

Multiply -3 * 5
6 = -15 + b

Solving
6 = -15 + b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
6 + -1b = -15 + b + -1b

Combine like terms: b + -1b = 0
6 + -1b = -15 + 0
6 + -1b = -15

Add '-6' to each side of the equation.
6 + -6 + -1b = -15 + -6

Combine like terms: 6 + -6 = 0
0 + -1b = -15 + -6
-1b = -15 + -6

Combine like terms: -15 + -6 = -21
-1b = -21

Divide each side by '-1'.
b = 21

Simplifying
b = 21