x-9=.8(x+9)

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Solution for x-9=.8(x+9) equation:


Simplifying
x + -9 = 0.8(x + 9)

Reorder the terms:
-9 + x = 0.8(x + 9)

Reorder the terms:
-9 + x = 0.8(9 + x)
-9 + x = (9 * 0.8 + x * 0.8)
-9 + x = (7.2 + 0.8x)

Solving
-9 + x = 7.2 + 0.8x

Solving for variable 'x'.

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

Add '-0.8x' to each side of the equation.
-9 + x + -0.8x = 7.2 + 0.8x + -0.8x

Combine like terms: x + -0.8x = 0.2x
-9 + 0.2x = 7.2 + 0.8x + -0.8x

Combine like terms: 0.8x + -0.8x = 0.0
-9 + 0.2x = 7.2 + 0.0
-9 + 0.2x = 7.2

Add '9' to each side of the equation.
-9 + 9 + 0.2x = 7.2 + 9

Combine like terms: -9 + 9 = 0
0 + 0.2x = 7.2 + 9
0.2x = 7.2 + 9

Combine like terms: 7.2 + 9 = 16.2
0.2x = 16.2

Divide each side by '0.2'.
x = 81

Simplifying
x = 81

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