21X+21=84

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Solution for 21X+21=84 equation: 


Simplifying
21X + 21 = 84

Reorder the terms:
21 + 21X = 84

Solving
21 + 21X = 84

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 + 21X = 84 + -21

Combine like terms: 21 + -21 = 0
0 + 21X = 84 + -21
21X = 84 + -21

Combine like terms: 84 + -21 = 63
21X = 63

Divide each side by '21'.
X = 3

Simplifying
X = 3

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