x+13+x+13=18

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Solution for x+13+x+13=18 equation: 



x+13+x+13=18

We move all terms to the left:

x+13+x+13-(18)=0

We add all the numbers together, and all the variables

2x+8=0

We move all terms containing x to the left, all other terms to the right

2x=-8

x=-8/2

x=-4

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