5x-6x+8x=21

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Solution for 5x-6x+8x=21 equation: 


Simplifying
5x + -6x + 8x = 21

Combine like terms: 5x + -6x = -1x
-1x + 8x = 21

Combine like terms: -1x + 8x = 7x
7x = 21

Solving
7x = 21

Solving for variable 'x'.

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

Divide each side by '7'.
x = 3

Simplifying
x = 3

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