50+9-x=420

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Solution for 50+9-x=420 equation: 


Simplifying
50 + 9 + -1x = 420

Combine like terms: 50 + 9 = 59
59 + -1x = 420

Solving
59 + -1x = 420

Solving for variable 'x'.

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

Add '-59' to each side of the equation.
59 + -59 + -1x = 420 + -59

Combine like terms: 59 + -59 = 0
0 + -1x = 420 + -59
-1x = 420 + -59

Combine like terms: 420 + -59 = 361
-1x = 361

Divide each side by '-1'.
x = -361

Simplifying
x = -361

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