8=21+(X-1)

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Solution for 8=21+(X-1) equation: 


Simplifying
8 = 21 + (X + -1)

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

Remove parenthesis around (-1 + X)
8 = 21 + -1 + X

Combine like terms: 21 + -1 = 20
8 = 20 + X

Solving
8 = 20 + 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.
8 + -1X = 20 + X + -1X

Combine like terms: X + -1X = 0
8 + -1X = 20 + 0
8 + -1X = 20

Add '-8' to each side of the equation.
8 + -8 + -1X = 20 + -8

Combine like terms: 8 + -8 = 0
0 + -1X = 20 + -8
-1X = 20 + -8

Combine like terms: 20 + -8 = 12
-1X = 12

Divide each side by '-1'.
X = -12

Simplifying
X = -12

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