3x-45=21

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Solution for 3x-45=21 equation: 


Simplifying
3x + -45 = 21

Reorder the terms:
-45 + 3x = 21

Solving
-45 + 3x = 21

Solving for variable 'x'.

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

Add '45' to each side of the equation.
-45 + 45 + 3x = 21 + 45

Combine like terms: -45 + 45 = 0
0 + 3x = 21 + 45
3x = 21 + 45

Combine like terms: 21 + 45 = 66
3x = 66

Divide each side by '3'.
x = 22

Simplifying
x = 22

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