0.5-4=3.9x-21

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Solution for 0.5-4=3.9x-21 equation: 


Simplifying
0.5 + -4 = 3.9x + -21

Combine like terms: 0.5 + -4 = -3.5
-3.5 = 3.9x + -21

Reorder the terms:
-3.5 = -21 + 3.9x

Solving
-3.5 = -21 + 3.9x

Solving for variable 'x'.

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

Add '-3.9x' to each side of the equation.
-3.5 + -3.9x = -21 + 3.9x + -3.9x

Combine like terms: 3.9x + -3.9x = 0.0
-3.5 + -3.9x = -21 + 0.0
-3.5 + -3.9x = -21

Add '3.5' to each side of the equation.
-3.5 + 3.5 + -3.9x = -21 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -3.9x = -21 + 3.5
-3.9x = -21 + 3.5

Combine like terms: -21 + 3.5 = -17.5
-3.9x = -17.5

Divide each side by '-3.9'.
x = 4.487179487

Simplifying
x = 4.487179487

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