21=6-8x-1

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Solution for 21=6-8x-1 equation:


Simplifying
21 = 6 + -8x + -1

Reorder the terms:
21 = 6 + -1 + -8x

Combine like terms: 6 + -1 = 5
21 = 5 + -8x

Solving
21 = 5 + -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 = 5 + -8x + 8x

Combine like terms: -8x + 8x = 0
21 + 8x = 5 + 0
21 + 8x = 5

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

Combine like terms: 21 + -21 = 0
0 + 8x = 5 + -21
8x = 5 + -21

Combine like terms: 5 + -21 = -16
8x = -16

Divide each side by '8'.
x = -2

Simplifying
x = -2

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