.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 = 328
0.9x = 328

Divide each side by '0.9'.
x = 364.4444444

Simplifying
x = 364.4444444

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