9=-0.5x

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Solution for 9=-0.5x equation:


Simplifying
9 = -0.5x

Solving
9 = -0.5x

Solving for variable 'x'.

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

Add '0.5x' to each side of the equation.
9 + 0.5x = -0.5x + 0.5x

Combine like terms: -0.5x + 0.5x = 0.0
9 + 0.5x = 0.0

Add '-9' to each side of the equation.
9 + -9 + 0.5x = 0.0 + -9

Combine like terms: 9 + -9 = 0
0 + 0.5x = 0.0 + -9
0.5x = 0.0 + -9

Combine like terms: 0.0 + -9 = -9
0.5x = -9

Divide each side by '0.5'.
x = -18

Simplifying
x = -18

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