21x-8=20x+4

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Solution for 21x-8=20x+4 equation:


Simplifying
21x + -8 = 20x + 4

Reorder the terms:
-8 + 21x = 20x + 4

Reorder the terms:
-8 + 21x = 4 + 20x

Solving
-8 + 21x = 4 + 20x

Solving for variable 'x'.

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

Add '-20x' to each side of the equation.
-8 + 21x + -20x = 4 + 20x + -20x

Combine like terms: 21x + -20x = 1x
-8 + 1x = 4 + 20x + -20x

Combine like terms: 20x + -20x = 0
-8 + 1x = 4 + 0
-8 + 1x = 4

Add '8' to each side of the equation.
-8 + 8 + 1x = 4 + 8

Combine like terms: -8 + 8 = 0
0 + 1x = 4 + 8
1x = 4 + 8

Combine like terms: 4 + 8 = 12
1x = 12

Divide each side by '1'.
x = 12

Simplifying
x = 12

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