20.5=-2(x+4)

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Solution for 20.5=-2(x+4) equation: 


Simplifying
20.5 = -2(x + 4)

Reorder the terms:
20.5 = -2(4 + x)
20.5 = (4 * -2 + x * -2)
20.5 = (-8 + -2x)

Solving
20.5 = -8 + -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.
20.5 + 2x = -8 + -2x + 2x

Combine like terms: -2x + 2x = 0
20.5 + 2x = -8 + 0
20.5 + 2x = -8

Add '-20.5' to each side of the equation.
20.5 + -20.5 + 2x = -8 + -20.5

Combine like terms: 20.5 + -20.5 = 0.0
0.0 + 2x = -8 + -20.5
2x = -8 + -20.5

Combine like terms: -8 + -20.5 = -28.5
2x = -28.5

Divide each side by '2'.
x = -14.25

Simplifying
x = -14.25

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