.4x+.5(x+400)=128

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Solution for .4x+.5(x+400)=128 equation:


Simplifying
0.4x + 0.5(x + 400) = 128

Reorder the terms:
0.4x + 0.5(400 + x) = 128
0.4x + (400 * 0.5 + x * 0.5) = 128
0.4x + (200 + 0.5x) = 128

Reorder the terms:
200 + 0.4x + 0.5x = 128

Combine like terms: 0.4x + 0.5x = 0.9x
200 + 0.9x = 128

Solving
200 + 0.9x = 128

Solving for variable 'x'.

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

Add '-200' to each side of the equation.
200 + -200 + 0.9x = 128 + -200

Combine like terms: 200 + -200 = 0
0 + 0.9x = 128 + -200
0.9x = 128 + -200

Combine like terms: 128 + -200 = -72
0.9x = -72

Divide each side by '0.9'.
x = -80

Simplifying
x = -80

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