U=3(7n+31)+7(n+1)

Solution for U=3(7n+31)+7(n+1) equation:

Simplifying
U = 3(7n + 31) + 7(n + 1)

Reorder the terms:
U = 3(31 + 7n) + 7(n + 1)
U = (31 * 3 + 7n * 3) + 7(n + 1)
U = (93 + 21n) + 7(n + 1)

Reorder the terms:
U = 93 + 21n + 7(1 + n)
U = 93 + 21n + (1 * 7 + n * 7)
U = 93 + 21n + (7 + 7n)

Reorder the terms:
U = 93 + 7 + 21n + 7n

Combine like terms: 93 + 7 = 100
U = 100 + 21n + 7n

Combine like terms: 21n + 7n = 28n
U = 100 + 28n

Solving
U = 100 + 28n

Solving for variable 'U'.

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

Simplifying
U = 100 + 28n