3+9+x=5+7

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Solution for 3+9+x=5+7 equation: 


Simplifying
3 + 9 + x = 5 + 7

Combine like terms: 3 + 9 = 12
12 + x = 5 + 7

Combine like terms: 5 + 7 = 12
12 + x = 12

Add '-12' to each side of the equation.
12 + -12 + x = 12 + -12

Combine like terms: 12 + -12 = 0
0 + x = 12 + -12
x = 12 + -12

Combine like terms: 12 + -12 = 0
x = 0

Solving
x = 0

Solving for variable 'x'.

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

Simplifying
x = 0

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