3x=18-21

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Solution for 3x=18-21 equation: 


Simplifying
3x = 18 + -21

Combine like terms: 18 + -21 = -3
3x = -3

Solving
3x = -3

Solving for variable 'x'.

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

Divide each side by '3'.
x = -1

Simplifying
x = -1

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