3(2n+7)=15(n-4)

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Solution for 3(2n+7)=15(n-4) equation:


Simplifying
3(2n + 7) = 15(n + -4)

Reorder the terms:
3(7 + 2n) = 15(n + -4)
(7 * 3 + 2n * 3) = 15(n + -4)
(21 + 6n) = 15(n + -4)

Reorder the terms:
21 + 6n = 15(-4 + n)
21 + 6n = (-4 * 15 + n * 15)
21 + 6n = (-60 + 15n)

Solving
21 + 6n = -60 + 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.
21 + 6n + -15n = -60 + 15n + -15n

Combine like terms: 6n + -15n = -9n
21 + -9n = -60 + 15n + -15n

Combine like terms: 15n + -15n = 0
21 + -9n = -60 + 0
21 + -9n = -60

Add '-21' to each side of the equation.
21 + -21 + -9n = -60 + -21

Combine like terms: 21 + -21 = 0
0 + -9n = -60 + -21
-9n = -60 + -21

Combine like terms: -60 + -21 = -81
-9n = -81

Divide each side by '-9'.
n = 9

Simplifying
n = 9

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