5+3X-8=21

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Solution for 5+3X-8=21 equation: 


Simplifying
5 + 3X + -8 = 21

Reorder the terms:
5 + -8 + 3X = 21

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

Solving
-3 + 3X = 21

Solving for variable 'X'.

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

Add '3' to each side of the equation.
-3 + 3 + 3X = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 3X = 21 + 3
3X = 21 + 3

Combine like terms: 21 + 3 = 24
3X = 24

Divide each side by '3'.
X = 8

Simplifying
X = 8

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