21=5x+3x-3

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Solution for 21=5x+3x-3 equation:


Simplifying
21 = 5x + 3x + -3

Reorder the terms:
21 = -3 + 5x + 3x

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

Solving
21 = -3 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
21 + -8x = -3 + 8x + -8x

Combine like terms: 8x + -8x = 0
21 + -8x = -3 + 0
21 + -8x = -3

Add '-21' to each side of the equation.
21 + -21 + -8x = -3 + -21

Combine like terms: 21 + -21 = 0
0 + -8x = -3 + -21
-8x = -3 + -21

Combine like terms: -3 + -21 = -24
-8x = -24

Divide each side by '-8'.
x = 3

Simplifying
x = 3

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