x-1+3x=21

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Solution for x-1+3x=21 equation: 


Simplifying
x + -1 + 3x = 21

Reorder the terms:
-1 + x + 3x = 21

Combine like terms: x + 3x = 4x
-1 + 4x = 21

Solving
-1 + 4x = 21

Solving for variable 'x'.

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

Add '1' to each side of the equation.
-1 + 1 + 4x = 21 + 1

Combine like terms: -1 + 1 = 0
0 + 4x = 21 + 1
4x = 21 + 1

Combine like terms: 21 + 1 = 22
4x = 22

Divide each side by '4'.
x = 5.5

Simplifying
x = 5.5

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