4x=18-21

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Solution for 4x=18-21 equation: 


Simplifying
4x = 18 + -21

Combine like terms: 18 + -21 = -3
4x = -3

Solving
4x = -3

Solving for variable 'x'.

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

Divide each side by '4'.
x = -0.75

Simplifying
x = -0.75

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