.10(9)+x=.20(9+x)

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Solution for .10(9)+x=.20(9+x) equation:


Simplifying
0.10(9) + x = 0.20(9 + x)

Multiply 0.10 * 9
0.9 + x = 0.20(9 + x)
0.9 + x = (9 * 0.20 + x * 0.20)
0.9 + x = (1.8 + 0.20x)

Solving
0.9 + x = 1.8 + 0.20x

Solving for variable 'x'.

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

Add '-0.20x' to each side of the equation.
0.9 + x + -0.20x = 1.8 + 0.20x + -0.20x

Combine like terms: x + -0.20x = 0.8x
0.9 + 0.8x = 1.8 + 0.20x + -0.20x

Combine like terms: 0.20x + -0.20x = 0.00
0.9 + 0.8x = 1.8 + 0.00
0.9 + 0.8x = 1.8

Add '-0.9' to each side of the equation.
0.9 + -0.9 + 0.8x = 1.8 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + 0.8x = 1.8 + -0.9
0.8x = 1.8 + -0.9

Combine like terms: 1.8 + -0.9 = 0.9
0.8x = 0.9

Divide each side by '0.8'.
x = 1.125

Simplifying
x = 1.125

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