4-8x=21

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Solution for 4-8x=21 equation: 


Simplifying
4 + -8x = 21

Solving
4 + -8x = 21

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + -8x = 21 + -4

Combine like terms: 4 + -4 = 0
0 + -8x = 21 + -4
-8x = 21 + -4

Combine like terms: 21 + -4 = 17
-8x = 17

Divide each side by '-8'.
x = -2.125

Simplifying
x = -2.125

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