5+5+X=12.9

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Solution for 5+5+X=12.9 equation: 


Simplifying
5 + 5 + X = 12.9

Combine like terms: 5 + 5 = 10
10 + X = 12.9

Solving
10 + X = 12.9

Solving for variable 'X'.

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

Add '-10' to each side of the equation.
10 + -10 + X = 12.9 + -10

Combine like terms: 10 + -10 = 0
0 + X = 12.9 + -10
X = 12.9 + -10

Combine like terms: 12.9 + -10 = 2.9
X = 2.9

Simplifying
X = 2.9

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