90=-3(-5n-5)

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Solution for 90=-3(-5n-5) equation:


Simplifying
90 = -3(-5n + -5)

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

Solving
90 = 15 + 15n

Solving for variable 'n'.

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

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

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

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

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

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

Divide each side by '-15'.
n = 5

Simplifying
n = 5

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