31-4x=21

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Solution for 31-4x=21 equation: 


Simplifying
31 + -4x = 21

Solving
31 + -4x = 21

Solving for variable 'x'.

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

Add '-31' to each side of the equation.
31 + -31 + -4x = 21 + -31

Combine like terms: 31 + -31 = 0
0 + -4x = 21 + -31
-4x = 21 + -31

Combine like terms: 21 + -31 = -10
-4x = -10

Divide each side by '-4'.
x = 2.5

Simplifying
x = 2.5

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