4X-21=x+15

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Solution for 4X-21=x+15 equation: 


Simplifying
4X + -21 = x + 15

Reorder the terms:
-21 + 4X = x + 15

Reorder the terms:
-21 + 4X = 15 + x

Solving
-21 + 4X = 15 + x

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 = 15 + 21 + x

Combine like terms: -21 + 21 = 0
0 + 4X = 15 + 21 + x
4X = 15 + 21 + x

Combine like terms: 15 + 21 = 36
4X = 36 + x

Divide each side by '4'.
X = 9 + 0.25x

Simplifying
X = 9 + 0.25x

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