(3n)+(4n-15)=90

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Solution for (3n)+(4n-15)=90 equation:


Simplifying
(3n) + (4n + -15) = 90

Reorder the terms:
(3n) + (-15 + 4n) = 90

Remove parenthesis around (-15 + 4n)
(3n) + -15 + 4n = 90

Reorder the terms:
-15 + (3n) + 4n = 90

Combine like terms: (3n) + 4n = 7n
-15 + 7n = 90

Solving
-15 + 7n = 90

Solving for variable 'n'.

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

Add '15' to each side of the equation.
-15 + 15 + 7n = 90 + 15

Combine like terms: -15 + 15 = 0
0 + 7n = 90 + 15
7n = 90 + 15

Combine like terms: 90 + 15 = 105
7n = 105

Divide each side by '7'.
n = 15

Simplifying
n = 15

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