8+9+x=20

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Solution for 8+9+x=20 equation: 


Simplifying
8 + 9 + x = 20

Combine like terms: 8 + 9 = 17
17 + x = 20

Solving
17 + x = 20

Solving for variable 'x'.

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

Add '-17' to each side of the equation.
17 + -17 + x = 20 + -17

Combine like terms: 17 + -17 = 0
0 + x = 20 + -17
x = 20 + -17

Combine like terms: 20 + -17 = 3
x = 3

Simplifying
x = 3

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