21-3x=-15

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Solution for 21-3x=-15 equation: 


Simplifying
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 = -36
-3x = -36

Divide each side by '-3'.
x = 12

Simplifying
x = 12

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