42-x=9

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Solution for 42-x=9 equation: 


Simplifying
42 + -1x = 9

Solving
42 + -1x = 9

Solving for variable 'x'.

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

Add '-42' to each side of the equation.
42 + -42 + -1x = 9 + -42

Combine like terms: 42 + -42 = 0
0 + -1x = 9 + -42
-1x = 9 + -42

Combine like terms: 9 + -42 = -33
-1x = -33

Divide each side by '-1'.
x = 33

Simplifying
x = 33

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