(X+13)+(2X+23)=90

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Solution for (X+13)+(2X+23)=90 equation: 


Simplifying
(X + 13) + (2X + 23) = 90

Reorder the terms:
(13 + X) + (2X + 23) = 90

Remove parenthesis around (13 + X)
13 + X + (2X + 23) = 90

Reorder the terms:
13 + X + (23 + 2X) = 90

Remove parenthesis around (23 + 2X)
13 + X + 23 + 2X = 90

Reorder the terms:
13 + 23 + X + 2X = 90

Combine like terms: 13 + 23 = 36
36 + X + 2X = 90

Combine like terms: X + 2X = 3X
36 + 3X = 90

Solving
36 + 3X = 90

Solving for variable 'X'.

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

Add '-36' to each side of the equation.
36 + -36 + 3X = 90 + -36

Combine like terms: 36 + -36 = 0
0 + 3X = 90 + -36
3X = 90 + -36

Combine like terms: 90 + -36 = 54
3X = 54

Divide each side by '3'.
X = 18

Simplifying
X = 18

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