m+3(m+7)=

Solution for m+3(m+7)= equation:

Simplifying
m + 3(m + 7) = 0

Reorder the terms:
m + 3(7 + m) = 0
m + (7 * 3 + m * 3) = 0
m + (21 + 3m) = 0

Reorder the terms:
21 + m + 3m = 0

Combine like terms: m + 3m = 4m
21 + 4m = 0

Solving
21 + 4m = 0

Solving for variable 'm'.

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

Add '-21' to each side of the equation.
21 + -21 + 4m = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 4m = 0 + -21
4m = 0 + -21

Combine like terms: 0 + -21 = -21
4m = -21

Divide each side by '4'.
m = -5.25

Simplifying
m = -5.25