21=7(3n-5)+7(n+8)

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Solution for 21=7(3n-5)+7(n+8) equation:


Simplifying
21 = 7(3n + -5) + 7(n + 8)

Reorder the terms:
21 = 7(-5 + 3n) + 7(n + 8)
21 = (-5 * 7 + 3n * 7) + 7(n + 8)
21 = (-35 + 21n) + 7(n + 8)

Reorder the terms:
21 = -35 + 21n + 7(8 + n)
21 = -35 + 21n + (8 * 7 + n * 7)
21 = -35 + 21n + (56 + 7n)

Reorder the terms:
21 = -35 + 56 + 21n + 7n

Combine like terms: -35 + 56 = 21
21 = 21 + 21n + 7n

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

Add '-21' to each side of the equation.
21 + -21 = 21 + -21 + 28n

Combine like terms: 21 + -21 = 0
0 = 21 + -21 + 28n

Combine like terms: 21 + -21 = 0
0 = 0 + 28n
0 = 28n

Solving
0 = 28n

Solving for variable 'n'.

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

Add '-28n' to each side of the equation.
0 + -28n = 28n + -28n
Remove the zero:
-28n = 28n + -28n

Combine like terms: 28n + -28n = 0
-28n = 0

Divide each side by '-28'.
n = 0

Simplifying
n = 0

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