91=4(1+9n)+7(1-4n)

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Solution for 91=4(1+9n)+7(1-4n) equation:


Simplifying
91 = 4(1 + 9n) + 7(1 + -4n)
91 = (1 * 4 + 9n * 4) + 7(1 + -4n)
91 = (4 + 36n) + 7(1 + -4n)
91 = 4 + 36n + (1 * 7 + -4n * 7)
91 = 4 + 36n + (7 + -28n)

Reorder the terms:
91 = 4 + 7 + 36n + -28n

Combine like terms: 4 + 7 = 11
91 = 11 + 36n + -28n

Combine like terms: 36n + -28n = 8n
91 = 11 + 8n

Solving
91 = 11 + 8n

Solving for variable 'n'.

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

Add '-8n' to each side of the equation.
91 + -8n = 11 + 8n + -8n

Combine like terms: 8n + -8n = 0
91 + -8n = 11 + 0
91 + -8n = 11

Add '-91' to each side of the equation.
91 + -91 + -8n = 11 + -91

Combine like terms: 91 + -91 = 0
0 + -8n = 11 + -91
-8n = 11 + -91

Combine like terms: 11 + -91 = -80
-8n = -80

Divide each side by '-8'.
n = 10

Simplifying
n = 10

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