-21-X+4X=18

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Solution for -21-X+4X=18 equation: 


Simplifying
-21 + -1X + 4X = 18

Combine like terms: -1X + 4X = 3X
-21 + 3X = 18

Solving
-21 + 3X = 18

Solving for variable 'X'.

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

Add '21' to each side of the equation.
-21 + 21 + 3X = 18 + 21

Combine like terms: -21 + 21 = 0
0 + 3X = 18 + 21
3X = 18 + 21

Combine like terms: 18 + 21 = 39
3X = 39

Divide each side by '3'.
X = 13

Simplifying
X = 13

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