18=12-(X+3)

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Solution for 18=12-(X+3) equation:


Simplifying
18 = 12 + -1(X + 3)

Reorder the terms:
18 = 12 + -1(3 + X)
18 = 12 + (3 * -1 + X * -1)
18 = 12 + (-3 + -1X)

Combine like terms: 12 + -3 = 9
18 = 9 + -1X

Solving
18 = 9 + -1X

Solving for variable 'X'.

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

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

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

Add '-18' to each side of the equation.
18 + -18 + X = 9 + -18

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

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

Simplifying
X = -9

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