.1(x+40)-0.06(x-20)=6.4

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Solution for .1(x+40)-0.06(x-20)=6.4 equation:


Simplifying
0.1(x + 40) + -0.06(x + -20) = 6.4

Reorder the terms:
0.1(40 + x) + -0.06(x + -20) = 6.4
(40 * 0.1 + x * 0.1) + -0.06(x + -20) = 6.4
(4 + 0.1x) + -0.06(x + -20) = 6.4

Reorder the terms:
4 + 0.1x + -0.06(-20 + x) = 6.4
4 + 0.1x + (-20 * -0.06 + x * -0.06) = 6.4
4 + 0.1x + (1.2 + -0.06x) = 6.4

Reorder the terms:
4 + 1.2 + 0.1x + -0.06x = 6.4

Combine like terms: 4 + 1.2 = 5.2
5.2 + 0.1x + -0.06x = 6.4

Combine like terms: 0.1x + -0.06x = 0.04x
5.2 + 0.04x = 6.4

Solving
5.2 + 0.04x = 6.4

Solving for variable 'x'.

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

Add '-5.2' to each side of the equation.
5.2 + -5.2 + 0.04x = 6.4 + -5.2

Combine like terms: 5.2 + -5.2 = 0.0
0.0 + 0.04x = 6.4 + -5.2
0.04x = 6.4 + -5.2

Combine like terms: 6.4 + -5.2 = 1.2
0.04x = 1.2

Divide each side by '0.04'.
x = 30

Simplifying
x = 30

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