21=-2x-6

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Solution for 21=-2x-6 equation:


Simplifying
21 = -2x + -6

Reorder the terms:
21 = -6 + -2x

Solving
21 = -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.
21 + 2x = -6 + -2x + 2x

Combine like terms: -2x + 2x = 0
21 + 2x = -6 + 0
21 + 2x = -6

Add '-21' to each side of the equation.
21 + -21 + 2x = -6 + -21

Combine like terms: 21 + -21 = 0
0 + 2x = -6 + -21
2x = -6 + -21

Combine like terms: -6 + -21 = -27
2x = -27

Divide each side by '2'.
x = -13.5

Simplifying
x = -13.5

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