-x-13=-21

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Solution for -x-13=-21 equation: 


Simplifying
-1x + -13 = -21

Reorder the terms:
-13 + -1x = -21

Solving
-13 + -1x = -21

Solving for variable 'x'.

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

Add '13' to each side of the equation.
-13 + 13 + -1x = -21 + 13

Combine like terms: -13 + 13 = 0
0 + -1x = -21 + 13
-1x = -21 + 13

Combine like terms: -21 + 13 = -8
-1x = -8

Divide each side by '-1'.
x = 8

Simplifying
x = 8

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