8+4+x=3+9

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Solution for 8+4+x=3+9 equation: 


Simplifying
8 + 4 + x = 3 + 9

Combine like terms: 8 + 4 = 12
12 + x = 3 + 9

Combine like terms: 3 + 9 = 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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