8x-21=42+5x

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Solution for 8x-21=42+5x equation:


Simplifying
8x + -21 = 42 + 5x

Reorder the terms:
-21 + 8x = 42 + 5x

Solving
-21 + 8x = 42 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
-21 + 8x + -5x = 42 + 5x + -5x

Combine like terms: 8x + -5x = 3x
-21 + 3x = 42 + 5x + -5x

Combine like terms: 5x + -5x = 0
-21 + 3x = 42 + 0
-21 + 3x = 42

Add '21' to each side of the equation.
-21 + 21 + 3x = 42 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 42 + 21
3x = 42 + 21

Combine like terms: 42 + 21 = 63
3x = 63

Divide each side by '3'.
x = 21

Simplifying
x = 21

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