5+8+x=20

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Solution for 5+8+x=20 equation: 


Simplifying
5 + 8 + x = 20

Combine like terms: 5 + 8 = 13
13 + x = 20

Solving
13 + x = 20

Solving for variable 'x'.

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

Add '-13' to each side of the equation.
13 + -13 + x = 20 + -13

Combine like terms: 13 + -13 = 0
0 + x = 20 + -13
x = 20 + -13

Combine like terms: 20 + -13 = 7
x = 7

Simplifying
x = 7

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