.50x+.30(140-x)=.40(140)

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Solution for .50x+.30(140-x)=.40(140) equation:


Simplifying
0.50x + 0.30(140 + -1x) = 0.40(140)
0.50x + (140 * 0.30 + -1x * 0.30) = 0.40(140)
0.50x + (42 + -0.3x) = 0.40(140)

Reorder the terms:
42 + 0.50x + -0.3x = 0.40(140)

Combine like terms: 0.50x + -0.3x = 0.2x
42 + 0.2x = 0.40(140)

Multiply 0.40 * 140
42 + 0.2x = 56

Solving
42 + 0.2x = 56

Solving for variable 'x'.

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

Add '-42' to each side of the equation.
42 + -42 + 0.2x = 56 + -42

Combine like terms: 42 + -42 = 0
0 + 0.2x = 56 + -42
0.2x = 56 + -42

Combine like terms: 56 + -42 = 14
0.2x = 14

Divide each side by '0.2'.
x = 70

Simplifying
x = 70

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