7n+18=6n-(n-9)

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Solution for 7n+18=6n-(n-9) equation:


Simplifying
7n + 18 = 6n + -1(n + -9)

Reorder the terms:
18 + 7n = 6n + -1(n + -9)

Reorder the terms:
18 + 7n = 6n + -1(-9 + n)
18 + 7n = 6n + (-9 * -1 + n * -1)
18 + 7n = 6n + (9 + -1n)

Reorder the terms:
18 + 7n = 9 + 6n + -1n

Combine like terms: 6n + -1n = 5n
18 + 7n = 9 + 5n

Solving
18 + 7n = 9 + 5n

Solving for variable 'n'.

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

Add '-5n' to each side of the equation.
18 + 7n + -5n = 9 + 5n + -5n

Combine like terms: 7n + -5n = 2n
18 + 2n = 9 + 5n + -5n

Combine like terms: 5n + -5n = 0
18 + 2n = 9 + 0
18 + 2n = 9

Add '-18' to each side of the equation.
18 + -18 + 2n = 9 + -18

Combine like terms: 18 + -18 = 0
0 + 2n = 9 + -18
2n = 9 + -18

Combine like terms: 9 + -18 = -9
2n = -9

Divide each side by '2'.
n = -4.5

Simplifying
n = -4.5

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