99=2(7n)+2(n+3)

Solution for 99=2(7n)+2(n+3) equation:

Simplifying
99 = 2(7n) + 2(n + 3)

Remove parenthesis around (7n)
99 = 2 * 7n + 2(n + 3)

Multiply 2 * 7
99 = 14n + 2(n + 3)

Reorder the terms:
99 = 14n + 2(3 + n)
99 = 14n + (3 * 2 + n * 2)
99 = 14n + (6 + 2n)

Reorder the terms:
99 = 6 + 14n + 2n

Combine like terms: 14n + 2n = 16n
99 = 6 + 16n

Solving
99 = 6 + 16n

Solving for variable 'n'.

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

Add '-16n' to each side of the equation.
99 + -16n = 6 + 16n + -16n

Combine like terms: 16n + -16n = 0
99 + -16n = 6 + 0
99 + -16n = 6

Add '-99' to each side of the equation.
99 + -99 + -16n = 6 + -99

Combine like terms: 99 + -99 = 0
0 + -16n = 6 + -99
-16n = 6 + -99

Combine like terms: 6 + -99 = -93
-16n = -93

Divide each side by '-16'.
n = 5.8125

Simplifying
n = 5.8125