21x-30=x+30

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Solution for 21x-30=x+30 equation:


Simplifying
21x + -30 = x + 30

Reorder the terms:
-30 + 21x = x + 30

Reorder the terms:
-30 + 21x = 30 + x

Solving
-30 + 21x = 30 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-30 + 21x + -1x = 30 + x + -1x

Combine like terms: 21x + -1x = 20x
-30 + 20x = 30 + x + -1x

Combine like terms: x + -1x = 0
-30 + 20x = 30 + 0
-30 + 20x = 30

Add '30' to each side of the equation.
-30 + 30 + 20x = 30 + 30

Combine like terms: -30 + 30 = 0
0 + 20x = 30 + 30
20x = 30 + 30

Combine like terms: 30 + 30 = 60
20x = 60

Divide each side by '20'.
x = 3

Simplifying
x = 3

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