105=7(3+m)

Solution for 105=7(3+m) equation:

Simplifying
105 = 7(3 + m)
105 = (3 * 7 + m * 7)
105 = (21 + 7m)

Solving
105 = 21 + 7m

Solving for variable 'm'.

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

Add '-7m' to each side of the equation.
105 + -7m = 21 + 7m + -7m

Combine like terms: 7m + -7m = 0
105 + -7m = 21 + 0
105 + -7m = 21

Add '-105' to each side of the equation.
105 + -105 + -7m = 21 + -105

Combine like terms: 105 + -105 = 0
0 + -7m = 21 + -105
-7m = 21 + -105

Combine like terms: 21 + -105 = -84
-7m = -84

Divide each side by '-7'.
m = 12

Simplifying
m = 12