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159=20+-7x+13-10
We move all terms to the left:
159-(20+-7x+13-10)=0
We add all the numbers together, and all the variables
-(-7x)+159=0
We get rid of parentheses
7x+159=0
We move all terms containing x to the left, all other terms to the right
7x=-159
x=-159/7
x=-22+5/7
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