x+x+x-1=20

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Solution for x+x+x-1=20 equation:


Simplifying
x + x + x + -1 = 20

Reorder the terms:
-1 + x + x + x = 20

Combine like terms: x + x = 2x
-1 + 2x + x = 20

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

Solving
-1 + 3x = 20

Solving for variable 'x'.

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

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

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

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

Divide each side by '3'.
x = 7

Simplifying
x = 7

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