X+21=3X-1

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


Simplifying
X + 21 = 3X + -1

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

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

Solving
21 + X = -1 + 3X

Solving for variable 'X'.

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

Add '-3X' to each side of the equation.
21 + X + -3X = -1 + 3X + -3X

Combine like terms: X + -3X = -2X
21 + -2X = -1 + 3X + -3X

Combine like terms: 3X + -3X = 0
21 + -2X = -1 + 0
21 + -2X = -1

Add '-21' to each side of the equation.
21 + -21 + -2X = -1 + -21

Combine like terms: 21 + -21 = 0
0 + -2X = -1 + -21
-2X = -1 + -21

Combine like terms: -1 + -21 = -22
-2X = -22

Divide each side by '-2'.
X = 11

Simplifying
X = 11

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