12+x=45-20

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Solution for 12+x=45-20 equation: 


Simplifying
12 + x = 45 + -20

Combine like terms: 45 + -20 = 25
12 + x = 25

Solving
12 + x = 25

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 = 25 + -12

Combine like terms: 12 + -12 = 0
0 + x = 25 + -12
x = 25 + -12

Combine like terms: 25 + -12 = 13
x = 13

Simplifying
x = 13

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