4x-6=21

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Solution for 4x-6=21 equation: 


Simplifying
4x + -6 = 21

Reorder the terms:
-6 + 4x = 21

Solving
-6 + 4x = 21

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + 4x = 21 + 6

Combine like terms: -6 + 6 = 0
0 + 4x = 21 + 6
4x = 21 + 6

Combine like terms: 21 + 6 = 27
4x = 27

Divide each side by '4'.
x = 6.75

Simplifying
x = 6.75

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