3(X+3)-X=15

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Solution for 3(X+3)-X=15 equation:


Simplifying
3(X + 3) + -1X = 15

Reorder the terms:
3(3 + X) + -1X = 15
(3 * 3 + X * 3) + -1X = 15
(9 + 3X) + -1X = 15

Combine like terms: 3X + -1X = 2X
9 + 2X = 15

Solving
9 + 2X = 15

Solving for variable 'X'.

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

Add '-9' to each side of the equation.
9 + -9 + 2X = 15 + -9

Combine like terms: 9 + -9 = 0
0 + 2X = 15 + -9
2X = 15 + -9

Combine like terms: 15 + -9 = 6
2X = 6

Divide each side by '2'.
X = 3

Simplifying
X = 3

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