-8X+5X=21

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Solution for -8X+5X=21 equation: 


Simplifying
-8X + 5X = 21

Combine like terms: -8X + 5X = -3X
-3X = 21

Solving
-3X = 21

Solving for variable 'X'.

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

Divide each side by '-3'.
X = -7

Simplifying
X = -7

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