.30x+.40(20-x)=.35(20)

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Solution for .30x+.40(20-x)=.35(20) equation:


Simplifying
0.30x + 0.40(20 + -1x) = 0.35(20)
0.30x + (20 * 0.40 + -1x * 0.40) = 0.35(20)
0.30x + (8 + -0.4x) = 0.35(20)

Reorder the terms:
8 + 0.30x + -0.4x = 0.35(20)

Combine like terms: 0.30x + -0.4x = -0.1x
8 + -0.1x = 0.35(20)

Multiply 0.35 * 20
8 + -0.1x = 7

Solving
8 + -0.1x = 7

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + -0.1x = 7 + -8

Combine like terms: 8 + -8 = 0
0 + -0.1x = 7 + -8
-0.1x = 7 + -8

Combine like terms: 7 + -8 = -1
-0.1x = -1

Divide each side by '-0.1'.
x = 10

Simplifying
x = 10

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