0.12=0.1*x+(0.18*(1-x))

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Solution for 0.12=0.1*x+(0.18*(1-x)) equation: 


Simplifying
0.12 = 0.1x + (0.18(1 + -1x))
0.12 = 0.1x + ((1 * 0.18 + -1x * 0.18))
0.12 = 0.1x + ((0.18 + -0.18x))
0.12 = 0.1x + (0.18 + -0.18x)

Remove parenthesis around (0.18 + -0.18x)
0.12 = 0.1x + 0.18 + -0.18x

Reorder the terms:
0.12 = 0.18 + 0.1x + -0.18x

Combine like terms: 0.1x + -0.18x = -0.08x
0.12 = 0.18 + -0.08x

Solving
0.12 = 0.18 + -0.08x

Solving for variable 'x'.

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

Add '0.08x' to each side of the equation.
0.12 + 0.08x = 0.18 + -0.08x + 0.08x

Combine like terms: -0.08x + 0.08x = 0.00
0.12 + 0.08x = 0.18 + 0.00
0.12 + 0.08x = 0.18

Add '-0.12' to each side of the equation.
0.12 + -0.12 + 0.08x = 0.18 + -0.12

Combine like terms: 0.12 + -0.12 = 0.00
0.00 + 0.08x = 0.18 + -0.12
0.08x = 0.18 + -0.12

Combine like terms: 0.18 + -0.12 = 0.06
0.08x = 0.06

Divide each side by '0.08'.
x = 0.75

Simplifying
x = 0.75

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