300=x-(x*0.3)

Solution for 300=x-(x*0.3) equation:

Simplifying
300 = x + -1(x * 0.3)

Reorder the terms for easier multiplication:
300 = x + -1(0.3x)

Remove parenthesis around (0.3x)
300 = x + -1 * 0.3x

Multiply -1 * 0.3
300 = x + -0.3x

Combine like terms: x + -0.3x = 0.7x
300 = 0.7x

Solving
300 = 0.7x

Solving for variable 'x'.

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

Add '-0.7x' to each side of the equation.
300 + -0.7x = 0.7x + -0.7x

Combine like terms: 0.7x + -0.7x = 0.0
300 + -0.7x = 0.0

Add '-300' to each side of the equation.
300 + -300 + -0.7x = 0.0 + -300

Combine like terms: 300 + -300 = 0
0 + -0.7x = 0.0 + -300
-0.7x = 0.0 + -300

Combine like terms: 0.0 + -300 = -300
-0.7x = -300

Divide each side by '-0.7'.
x = 428.5714286

Simplifying
x = 428.5714286