15-21=-2x

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Solution for 15-21=-2x equation:


Simplifying
15 + -21 = -2x

Combine like terms: 15 + -21 = -6
-6 = -2x

Solving
-6 = -2x

Solving for variable 'x'.

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

Add '2x' to each side of the equation.
-6 + 2x = -2x + 2x

Combine like terms: -2x + 2x = 0
-6 + 2x = 0

Add '6' to each side of the equation.
-6 + 6 + 2x = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 2x = 0 + 6
2x = 0 + 6

Combine like terms: 0 + 6 = 6
2x = 6

Divide each side by '2'.
x = 3

Simplifying
x = 3

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