90=3(2n+5)

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Solution for 90=3(2n+5) equation: 


Simplifying
90 = 3(2n + 5)

Reorder the terms:
90 = 3(5 + 2n)
90 = (5 * 3 + 2n * 3)
90 = (15 + 6n)

Solving
90 = 15 + 6n

Solving for variable 'n'.

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

Add '-6n' to each side of the equation.
90 + -6n = 15 + 6n + -6n

Combine like terms: 6n + -6n = 0
90 + -6n = 15 + 0
90 + -6n = 15

Add '-90' to each side of the equation.
90 + -90 + -6n = 15 + -90

Combine like terms: 90 + -90 = 0
0 + -6n = 15 + -90
-6n = 15 + -90

Combine like terms: 15 + -90 = -75
-6n = -75

Divide each side by '-6'.
n = 12.5

Simplifying
n = 12.5

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