8x+21-x=(x+3)

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Solution for 8x+21-x=(x+3) equation:


Simplifying
8x + 21 + -1x = (x + 3)

Reorder the terms:
21 + 8x + -1x = (x + 3)

Combine like terms: 8x + -1x = 7x
21 + 7x = (x + 3)

Reorder the terms:
21 + 7x = (3 + x)

Remove parenthesis around (3 + x)
21 + 7x = 3 + x

Solving
21 + 7x = 3 + 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.
21 + 7x + -1x = 3 + x + -1x

Combine like terms: 7x + -1x = 6x
21 + 6x = 3 + x + -1x

Combine like terms: x + -1x = 0
21 + 6x = 3 + 0
21 + 6x = 3

Add '-21' to each side of the equation.
21 + -21 + 6x = 3 + -21

Combine like terms: 21 + -21 = 0
0 + 6x = 3 + -21
6x = 3 + -21

Combine like terms: 3 + -21 = -18
6x = -18

Divide each side by '6'.
x = -3

Simplifying
x = -3

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