n-9=3(n-15)

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Solution for n-9=3(n-15) equation:


Simplifying
n + -9 = 3(n + -15)

Reorder the terms:
-9 + n = 3(n + -15)

Reorder the terms:
-9 + n = 3(-15 + n)
-9 + n = (-15 * 3 + n * 3)
-9 + n = (-45 + 3n)

Solving
-9 + n = -45 + 3n

Solving for variable 'n'.

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

Add '-3n' to each side of the equation.
-9 + n + -3n = -45 + 3n + -3n

Combine like terms: n + -3n = -2n
-9 + -2n = -45 + 3n + -3n

Combine like terms: 3n + -3n = 0
-9 + -2n = -45 + 0
-9 + -2n = -45

Add '9' to each side of the equation.
-9 + 9 + -2n = -45 + 9

Combine like terms: -9 + 9 = 0
0 + -2n = -45 + 9
-2n = -45 + 9

Combine like terms: -45 + 9 = -36
-2n = -36

Divide each side by '-2'.
n = 18

Simplifying
n = 18

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