3=3x+21

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Solution for 3=3x+21 equation:


Simplifying
3 = 3x + 21

Reorder the terms:
3 = 21 + 3x

Solving
3 = 21 + 3x

Solving for variable 'x'.

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

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

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

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

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

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

Divide each side by '-3'.
x = -6

Simplifying
x = -6

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