4x+21=8x-3

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Solution for 4x+21=8x-3 equation:


Simplifying
4x + 21 = 8x + -3

Reorder the terms:
21 + 4x = 8x + -3

Reorder the terms:
21 + 4x = -3 + 8x

Solving
21 + 4x = -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 + 4x + -8x = -3 + 8x + -8x

Combine like terms: 4x + -8x = -4x
21 + -4x = -3 + 8x + -8x

Combine like terms: 8x + -8x = 0
21 + -4x = -3 + 0
21 + -4x = -3

Add '-21' to each side of the equation.
21 + -21 + -4x = -3 + -21

Combine like terms: 21 + -21 = 0
0 + -4x = -3 + -21
-4x = -3 + -21

Combine like terms: -3 + -21 = -24
-4x = -24

Divide each side by '-4'.
x = 6

Simplifying
x = 6

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