4x=5x-21

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Solution for 4x=5x-21 equation: 


Simplifying
4x = 5x + -21

Reorder the terms:
4x = -21 + 5x

Solving
4x = -21 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
4x + -5x = -21 + 5x + -5x

Combine like terms: 4x + -5x = -1x
-1x = -21 + 5x + -5x

Combine like terms: 5x + -5x = 0
-1x = -21 + 0
-1x = -21

Divide each side by '-1'.
x = 21

Simplifying
x = 21

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