12-x=5+4

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Solution for 12-x=5+4 equation: 


Simplifying
12 + -1x = 5 + 4

Combine like terms: 5 + 4 = 9
12 + -1x = 9

Solving
12 + -1x = 9

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 + -1x = 9 + -12

Combine like terms: 12 + -12 = 0
0 + -1x = 9 + -12
-1x = 9 + -12

Combine like terms: 9 + -12 = -3
-1x = -3

Divide each side by '-1'.
x = 3

Simplifying
x = 3

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