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(-7x)-(-9x)+(-5x)+13x=20

We move all terms to the left:

(-7x)-(-9x)+(-5x)+13x-(20)=0

We add all the numbers together, and all the variables

13x+(-7x)-(-9x)+(-5x)-20=0

We get rid of parentheses

13x-7x+9x-5x-20=0

We add all the numbers together, and all the variables

10x-20=0

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

10x=20

x=20/10

x=2

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