120=0.5(200-x)

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Solution for 120=0.5(200-x) equation:


Simplifying
120 = 0.5(200 + -1x)
120 = (200 * 0.5 + -1x * 0.5)
120 = (100 + -0.5x)

Solving
120 = 100 + -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.
120 + 0.5x = 100 + -0.5x + 0.5x

Combine like terms: -0.5x + 0.5x = 0.0
120 + 0.5x = 100 + 0.0
120 + 0.5x = 100

Add '-120' to each side of the equation.
120 + -120 + 0.5x = 100 + -120

Combine like terms: 120 + -120 = 0
0 + 0.5x = 100 + -120
0.5x = 100 + -120

Combine like terms: 100 + -120 = -20
0.5x = -20

Divide each side by '0.5'.
x = -40

Simplifying
x = -40

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