99=3(1+4m)

Solution for 99=3(1+4m) equation:

Simplifying
99 = 3(1 + 4m)
99 = (1 * 3 + 4m * 3)
99 = (3 + 12m)

Solving
99 = 3 + 12m

Solving for variable 'm'.

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

Add '-12m' to each side of the equation.
99 + -12m = 3 + 12m + -12m

Combine like terms: 12m + -12m = 0
99 + -12m = 3 + 0
99 + -12m = 3

Add '-99' to each side of the equation.
99 + -99 + -12m = 3 + -99

Combine like terms: 99 + -99 = 0
0 + -12m = 3 + -99
-12m = 3 + -99

Combine like terms: 3 + -99 = -96
-12m = -96

Divide each side by '-12'.
m = 8

Simplifying
m = 8