12+9X=40

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Solution for 12+9X=40 equation: 


Simplifying
12 + 9X = 40

Solving
12 + 9X = 40

Solving for variable 'X'.

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

Add '-12' to each side of the equation.
12 + -12 + 9X = 40 + -12

Combine like terms: 12 + -12 = 0
0 + 9X = 40 + -12
9X = 40 + -12

Combine like terms: 40 + -12 = 28
9X = 28

Divide each side by '9'.
X = 3.111111111

Simplifying
X = 3.111111111

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