X+X+X-15=180

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Solution for X+X+X-15=180 equation:


Simplifying
X + X + X + -15 = 180

Reorder the terms:
-15 + X + X + X = 180

Combine like terms: X + X = 2X
-15 + 2X + X = 180

Combine like terms: 2X + X = 3X
-15 + 3X = 180

Solving
-15 + 3X = 180

Solving for variable 'X'.

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

Add '15' to each side of the equation.
-15 + 15 + 3X = 180 + 15

Combine like terms: -15 + 15 = 0
0 + 3X = 180 + 15
3X = 180 + 15

Combine like terms: 180 + 15 = 195
3X = 195

Divide each side by '3'.
X = 65

Simplifying
X = 65

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