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159=13x+3
We move all terms to the left:
159-(13x+3)=0
We get rid of parentheses
-13x-3+159=0
We add all the numbers together, and all the variables
-13x+156=0
We move all terms containing x to the left, all other terms to the right
-13x=-156
x=-156/-13
x=+12
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