X-12+x+21=-1

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Solution for X-12+x+21=-1 equation:


Simplifying
X + -12 + x + 21 = -1

Reorder the terms:
-12 + 21 + X + x = -1

Combine like terms: -12 + 21 = 9
9 + X + x = -1

Solving
9 + X + x = -1

Solving for variable 'X'.

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

Add '-9' to each side of the equation.
9 + X + -9 + x = -1 + -9

Reorder the terms:
9 + -9 + X + x = -1 + -9

Combine like terms: 9 + -9 = 0
0 + X + x = -1 + -9
X + x = -1 + -9

Combine like terms: -1 + -9 = -10
X + x = -10

Add '-1x' to each side of the equation.
X + x + -1x = -10 + -1x

Combine like terms: x + -1x = 0
X + 0 = -10 + -1x
X = -10 + -1x

Simplifying
X = -10 + -1x

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