p=4m-((2m+n)-(4m-7n)+(2m-8n))

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Solution for p=4m-((2m+n)-(4m-7n)+(2m-8n)) equation: 


Simplifying
p = 4m + -1((2m + n) + -1(4m + -7n) + (2m + -8n))

Remove parenthesis around (2m + n)
p = 4m + -1(2m + n + -1(4m + -7n) + (2m + -8n))
p = 4m + -1(2m + n + (4m * -1 + -7n * -1) + (2m + -8n))
p = 4m + -1(2m + n + (-4m + 7n) + (2m + -8n))

Remove parenthesis around (2m + -8n)
p = 4m + -1(2m + n + -4m + 7n + 2m + -8n)

Reorder the terms:
p = 4m + -1(2m + -4m + 2m + n + 7n + -8n)

Combine like terms: 2m + -4m = -2m
p = 4m + -1(-2m + 2m + n + 7n + -8n)

Combine like terms: -2m + 2m = 0
p = 4m + -1(0 + n + 7n + -8n)
p = 4m + -1(n + 7n + -8n)

Combine like terms: n + 7n = 8n
p = 4m + -1(8n + -8n)

Combine like terms: 8n + -8n = 0
p = 4m + -1(0)

Multiply -1 * 0
p = 4m + 0

Anything times zero is zero.
p = 4m + 0

Reorder the terms:
p = 0 + 4m
Remove the zero:
p = 4m

Solving
p = 4m

Solving for variable 'p'.

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

Simplifying
p = 4m

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