3x+21=15

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Solution for 3x+21=15 equation: 


Simplifying
3x + 21 = 15

Reorder the terms:
21 + 3x = 15

Solving
21 + 3x = 15

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 3x = 15 + -21

Combine like terms: 21 + -21 = 0
0 + 3x = 15 + -21
3x = 15 + -21

Combine like terms: 15 + -21 = -6
3x = -6

Divide each side by '3'.
x = -2

Simplifying
x = -2

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