.02x+.15(8-x)=0.4

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Solution for .02x+.15(8-x)=0.4 equation:


Simplifying
0.02x + 0.15(8 + -1x) = 0.4
0.02x + (8 * 0.15 + -1x * 0.15) = 0.4
0.02x + (1.2 + -0.15x) = 0.4

Reorder the terms:
1.2 + 0.02x + -0.15x = 0.4

Combine like terms: 0.02x + -0.15x = -0.13x
1.2 + -0.13x = 0.4

Solving
1.2 + -0.13x = 0.4

Solving for variable 'x'.

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

Add '-1.2' to each side of the equation.
1.2 + -1.2 + -0.13x = 0.4 + -1.2

Combine like terms: 1.2 + -1.2 = 0.0
0.0 + -0.13x = 0.4 + -1.2
-0.13x = 0.4 + -1.2

Combine like terms: 0.4 + -1.2 = -0.8
-0.13x = -0.8

Divide each side by '-0.13'.
x = 6.153846154

Simplifying
x = 6.153846154

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