.30x+(.20)(12-x)=(.25)(12)

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Solution for .30x+(.20)(12-x)=(.25)(12) equation: 


Simplifying
0.30x + (0.20)(12 + -1x) = (0.25)(12)
0.30x + (12 * 0.20 + -1x * 0.20) = (0.25)(12)
0.30x + (2.4 + -0.2x) = (0.25)(12)

Reorder the terms:
2.4 + 0.30x + -0.2x = (0.25)(12)

Combine like terms: 0.30x + -0.2x = 0.1x
2.4 + 0.1x = (0.25)(12)

Multiply 0.25 * 12
2.4 + 0.1x = 3

Solving
2.4 + 0.1x = 3

Solving for variable 'x'.

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

Add '-2.4' to each side of the equation.
2.4 + -2.4 + 0.1x = 3 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
0.0 + 0.1x = 3 + -2.4
0.1x = 3 + -2.4

Combine like terms: 3 + -2.4 = 0.6
0.1x = 0.6

Divide each side by '0.1'.
x = 6

Simplifying
x = 6

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