3(7+b)=15

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Solution for 3(7+b)=15 equation: 


Simplifying
3(7 + b) = 15
(7 * 3 + b * 3) = 15
(21 + 3b) = 15

Solving
21 + 3b = 15

Solving for variable 'b'.

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

Add '-21' to each side of the equation.
21 + -21 + 3b = 15 + -21

Combine like terms: 21 + -21 = 0
0 + 3b = 15 + -21
3b = 15 + -21

Combine like terms: 15 + -21 = -6
3b = -6

Divide each side by '3'.
b = -2

Simplifying
b = -2

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