28=X-(-9)

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Solution for 28=X-(-9) equation:


Simplifying
28 = X + -1(-9)

Multiply -1 * -9
28 = X + 9

Reorder the terms:
28 = 9 + X

Solving
28 = 9 + 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.
28 + -1X = 9 + X + -1X

Combine like terms: X + -1X = 0
28 + -1X = 9 + 0
28 + -1X = 9

Add '-28' to each side of the equation.
28 + -28 + -1X = 9 + -28

Combine like terms: 28 + -28 = 0
0 + -1X = 9 + -28
-1X = 9 + -28

Combine like terms: 9 + -28 = -19
-1X = -19

Divide each side by '-1'.
X = 19

Simplifying
X = 19

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