x-8.4=21

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Solution for x-8.4=21 equation: 


Simplifying
x + -8.4 = 21

Reorder the terms:
-8.4 + x = 21

Solving
-8.4 + x = 21

Solving for variable 'x'.

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

Add '8.4' to each side of the equation.
-8.4 + 8.4 + x = 21 + 8.4

Combine like terms: -8.4 + 8.4 = 0.0
0.0 + x = 21 + 8.4
x = 21 + 8.4

Combine like terms: 21 + 8.4 = 29.4
x = 29.4

Simplifying
x = 29.4

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