4+5+X+X=28

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Solution for 4+5+X+X=28 equation: 


Simplifying
4 + 5 + X + X = 28

Combine like terms: 4 + 5 = 9
9 + X + X = 28

Combine like terms: X + X = 2X
9 + 2X = 28

Solving
9 + 2X = 28

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 = 28 + -9

Combine like terms: 9 + -9 = 0
0 + 2X = 28 + -9
2X = 28 + -9

Combine like terms: 28 + -9 = 19
2X = 19

Divide each side by '2'.
X = 9.5

Simplifying
X = 9.5

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