10n+7+5n=8n-21

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Solution for 10n+7+5n=8n-21 equation:


Simplifying
10n + 7 + 5n = 8n + -21

Reorder the terms:
7 + 10n + 5n = 8n + -21

Combine like terms: 10n + 5n = 15n
7 + 15n = 8n + -21

Reorder the terms:
7 + 15n = -21 + 8n

Solving
7 + 15n = -21 + 8n

Solving for variable 'n'.

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

Add '-8n' to each side of the equation.
7 + 15n + -8n = -21 + 8n + -8n

Combine like terms: 15n + -8n = 7n
7 + 7n = -21 + 8n + -8n

Combine like terms: 8n + -8n = 0
7 + 7n = -21 + 0
7 + 7n = -21

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

Combine like terms: 7 + -7 = 0
0 + 7n = -21 + -7
7n = -21 + -7

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

Divide each side by '7'.
n = -4

Simplifying
n = -4

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