.22=x+1.8(12-X)

Solution for .22=x+1.8(12-X) equation:

Simplifying
0.22 = x + 1.8(12 + -1X)
0.22 = x + (12 * 1.8 + -1X * 1.8)
0.22 = x + (21.6 + -1.8X)

Reorder the terms:
0.22 = 21.6 + -1.8X + x

Solving
0.22 = 21.6 + -1.8X + x

Solving for variable 'X'.

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

Add '1.8X' to each side of the equation.
0.22 + 1.8X = 21.6 + -1.8X + 1.8X + x

Combine like terms: -1.8X + 1.8X = 0.0
0.22 + 1.8X = 21.6 + 0.0 + x
0.22 + 1.8X = 21.6 + x

Add '-0.22' to each side of the equation.
0.22 + -0.22 + 1.8X = 21.6 + -0.22 + x

Combine like terms: 0.22 + -0.22 = 0.00
0.00 + 1.8X = 21.6 + -0.22 + x
1.8X = 21.6 + -0.22 + x

Combine like terms: 21.6 + -0.22 = 21.38
1.8X = 21.38 + x

Divide each side by '1.8'.
X = 11.87777778 + 0.5555555556x

Simplifying
X = 11.87777778 + 0.5555555556x