n*2+(n-1)=20

Solution for n*2+(n-1)=20 equation:

Simplifying
n * 2 + (n + -1) = 20

Reorder the terms for easier multiplication:
2n + (n + -1) = 20

Reorder the terms:
2n + (-1 + n) = 20

Remove parenthesis around (-1 + n)
2n + -1 + n = 20

Reorder the terms:
-1 + 2n + n = 20

Combine like terms: 2n + n = 3n
-1 + 3n = 20

Solving
-1 + 3n = 20

Solving for variable 'n'.

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

Add '1' to each side of the equation.
-1 + 1 + 3n = 20 + 1

Combine like terms: -1 + 1 = 0
0 + 3n = 20 + 1
3n = 20 + 1

Combine like terms: 20 + 1 = 21
3n = 21

Divide each side by '3'.
n = 7

Simplifying
n = 7