18=0.9(x-1)

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Solution for 18=0.9(x-1) equation:


Simplifying
18 = 0.9(x + -1)

Reorder the terms:
18 = 0.9(-1 + x)
18 = (-1 * 0.9 + x * 0.9)
18 = (-0.9 + 0.9x)

Solving
18 = -0.9 + 0.9x

Solving for variable 'x'.

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

Add '-0.9x' to each side of the equation.
18 + -0.9x = -0.9 + 0.9x + -0.9x

Combine like terms: 0.9x + -0.9x = 0.0
18 + -0.9x = -0.9 + 0.0
18 + -0.9x = -0.9

Add '-18' to each side of the equation.
18 + -18 + -0.9x = -0.9 + -18

Combine like terms: 18 + -18 = 0
0 + -0.9x = -0.9 + -18
-0.9x = -0.9 + -18

Combine like terms: -0.9 + -18 = -18.9
-0.9x = -18.9

Divide each side by '-0.9'.
x = 21

Simplifying
x = 21

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