300-x=900

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Solution for 300-x=900 equation: 


Simplifying
300 + -1x = 900

Solving
300 + -1x = 900

Solving for variable 'x'.

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

Add '-300' to each side of the equation.
300 + -300 + -1x = 900 + -300

Combine like terms: 300 + -300 = 0
0 + -1x = 900 + -300
-1x = 900 + -300

Combine like terms: 900 + -300 = 600
-1x = 600

Divide each side by '-1'.
x = -600

Simplifying
x = -600

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