3X-9-3X-9=X-3X+3X-9-18

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Solution for 3X-9-3X-9=X-3X+3X-9-18 equation: 


Simplifying
3X + -9 + -3X + -9 = X + -3X + 3X + -9 + -18

Reorder the terms:
-9 + -9 + 3X + -3X = X + -3X + 3X + -9 + -18

Combine like terms: -9 + -9 = -18
-18 + 3X + -3X = X + -3X + 3X + -9 + -18

Combine like terms: 3X + -3X = 0
-18 + 0 = X + -3X + 3X + -9 + -18
-18 = X + -3X + 3X + -9 + -18

Reorder the terms:
-18 = -9 + -18 + X + -3X + 3X

Combine like terms: -9 + -18 = -27
-18 = -27 + X + -3X + 3X

Combine like terms: X + -3X = -2X
-18 = -27 + -2X + 3X

Combine like terms: -2X + 3X = 1X
-18 = -27 + 1X

Solving
-18 = -27 + 1X

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.
-18 + -1X = -27 + 1X + -1X

Combine like terms: 1X + -1X = 0
-18 + -1X = -27 + 0
-18 + -1X = -27

Add '18' to each side of the equation.
-18 + 18 + -1X = -27 + 18

Combine like terms: -18 + 18 = 0
0 + -1X = -27 + 18
-1X = -27 + 18

Combine like terms: -27 + 18 = -9
-1X = -9

Divide each side by '-1'.
X = 9

Simplifying
X = 9

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