4(n+9)-9(n-9)=102

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Solution for 4(n+9)-9(n-9)=102 equation:


Simplifying
4(n + 9) + -9(n + -9) = 102

Reorder the terms:
4(9 + n) + -9(n + -9) = 102
(9 * 4 + n * 4) + -9(n + -9) = 102
(36 + 4n) + -9(n + -9) = 102

Reorder the terms:
36 + 4n + -9(-9 + n) = 102
36 + 4n + (-9 * -9 + n * -9) = 102
36 + 4n + (81 + -9n) = 102

Reorder the terms:
36 + 81 + 4n + -9n = 102

Combine like terms: 36 + 81 = 117
117 + 4n + -9n = 102

Combine like terms: 4n + -9n = -5n
117 + -5n = 102

Solving
117 + -5n = 102

Solving for variable 'n'.

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

Add '-117' to each side of the equation.
117 + -117 + -5n = 102 + -117

Combine like terms: 117 + -117 = 0
0 + -5n = 102 + -117
-5n = 102 + -117

Combine like terms: 102 + -117 = -15
-5n = -15

Divide each side by '-5'.
n = 3

Simplifying
n = 3

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