18=3[X-1]

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Solution for 18=3[X-1] equation:


Simplifying
18 = 3[X + -1]

Reorder the terms:
18 = 3[-1 + X]
18 = [-1 * 3 + X * 3]
18 = [-3 + 3X]

Solving
18 = -3 + 3X

Solving for variable 'X'.

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

Add '-3X' to each side of the equation.
18 + -3X = -3 + 3X + -3X

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

Add '-18' to each side of the equation.
18 + -18 + -3X = -3 + -18

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

Combine like terms: -3 + -18 = -21
-3X = -21

Divide each side by '-3'.
X = 7

Simplifying
X = 7

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