420=n*2-1

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Solution for 420=n*2-1 equation:


Simplifying
420 = n * 2 + -1

Reorder the terms for easier multiplication:
420 = 2n + -1

Reorder the terms:
420 = -1 + 2n

Solving
420 = -1 + 2n

Solving for variable 'n'.

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

Add '-2n' to each side of the equation.
420 + -2n = -1 + 2n + -2n

Combine like terms: 2n + -2n = 0
420 + -2n = -1 + 0
420 + -2n = -1

Add '-420' to each side of the equation.
420 + -420 + -2n = -1 + -420

Combine like terms: 420 + -420 = 0
0 + -2n = -1 + -420
-2n = -1 + -420

Combine like terms: -1 + -420 = -421
-2n = -421

Divide each side by '-2'.
n = 210.5

Simplifying
n = 210.5

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