21-4x=-4

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Solution for 21-4x=-4 equation: 


Simplifying
21 + -4x = -4

Solving
21 + -4x = -4

Solving for variable 'x'.

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

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

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

Combine like terms: -4 + -21 = -25
-4x = -25

Divide each side by '-4'.
x = 6.25

Simplifying
x = 6.25

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