2(x+5)+(-x)=21

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Solution for 2(x+5)+(-x)=21 equation: 


Simplifying
2(x + 5) + (-1x) = 21

Reorder the terms:
2(5 + x) + (-1x) = 21
(5 * 2 + x * 2) + (-1x) = 21
(10 + 2x) + (-1x) = 21

Combine like terms: 2x + (-1x) = 1x
10 + 1x = 21

Solving
10 + 1x = 21

Solving for variable 'x'.

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

Add '-10' to each side of the equation.
10 + -10 + 1x = 21 + -10

Combine like terms: 10 + -10 = 0
0 + 1x = 21 + -10
1x = 21 + -10

Combine like terms: 21 + -10 = 11
1x = 11

Divide each side by '1'.
x = 11

Simplifying
x = 11

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