5+7+x=4

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Solution for 5+7+x=4 equation: 


Simplifying
5 + 7 + x = 4

Combine like terms: 5 + 7 = 12
12 + x = 4

Solving
12 + x = 4

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 + x = 4 + -12

Combine like terms: 12 + -12 = 0
0 + x = 4 + -12
x = 4 + -12

Combine like terms: 4 + -12 = -8
x = -8

Simplifying
x = -8

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