3+x+x=-21

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Solution for 3+x+x=-21 equation: 


Simplifying
3 + x + x = -21

Combine like terms: x + x = 2x
3 + 2x = -21

Solving
3 + 2x = -21

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 2x = -21 + -3

Combine like terms: 3 + -3 = 0
0 + 2x = -21 + -3
2x = -21 + -3

Combine like terms: -21 + -3 = -24
2x = -24

Divide each side by '2'.
x = -12

Simplifying
x = -12

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