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-5x-9+139=-20x-5
We move all terms to the left:
-5x-9+139-(-20x-5)=0
We add all the numbers together, and all the variables
-5x-(-20x-5)+130=0
We get rid of parentheses
-5x+20x+5+130=0
We add all the numbers together, and all the variables
15x+135=0
We move all terms containing x to the left, all other terms to the right
15x=-135
x=-135/15
x=-9
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