21=x+(x-5)

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Solution for 21=x+(x-5) equation:


Simplifying
21 = x + (x + -5)

Reorder the terms:
21 = x + (-5 + x)

Remove parenthesis around (-5 + x)
21 = x + -5 + x

Reorder the terms:
21 = -5 + x + x

Combine like terms: x + x = 2x
21 = -5 + 2x

Solving
21 = -5 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
21 + -2x = -5 + 2x + -2x

Combine like terms: 2x + -2x = 0
21 + -2x = -5 + 0
21 + -2x = -5

Add '-21' to each side of the equation.
21 + -21 + -2x = -5 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = -5 + -21
-2x = -5 + -21

Combine like terms: -5 + -21 = -26
-2x = -26

Divide each side by '-2'.
x = 13

Simplifying
x = 13

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