21x-21=3x-3

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


Simplifying
21x + -21 = 3x + -3

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

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

Solving
-21 + 21x = -3 + 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 + 21x + -3x = -3 + 3x + -3x

Combine like terms: 21x + -3x = 18x
-21 + 18x = -3 + 3x + -3x

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

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

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

Combine like terms: -3 + 21 = 18
18x = 18

Divide each side by '18'.
x = 1

Simplifying
x = 1

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