3x+x=9-21

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Solution for 3x+x=9-21 equation: 


Simplifying
3x + x = 9 + -21

Combine like terms: 3x + x = 4x
4x = 9 + -21

Combine like terms: 9 + -21 = -12
4x = -12

Solving
4x = -12

Solving for variable 'x'.

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

Divide each side by '4'.
x = -3

Simplifying
x = -3

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