20x=21x-4

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Solution for 20x=21x-4 equation: 


Simplifying
20x = 21x + -4

Reorder the terms:
20x = -4 + 21x

Solving
20x = -4 + 21x

Solving for variable 'x'.

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

Add '-21x' to each side of the equation.
20x + -21x = -4 + 21x + -21x

Combine like terms: 20x + -21x = -1x
-1x = -4 + 21x + -21x

Combine like terms: 21x + -21x = 0
-1x = -4 + 0
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4

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