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 = -6
-6 + x = 5 + 7

Combine like terms: 5 + 7 = 12
-6 + x = 12

Solving
-6 + x = 12

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + x = 12 + 6

Combine like terms: -6 + 6 = 0
0 + x = 12 + 6
x = 12 + 6

Combine like terms: 12 + 6 = 18
x = 18

Simplifying
x = 18

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