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-259-2x=-9x-126
We move all terms to the left:
-259-2x-(-9x-126)=0
We get rid of parentheses
-2x+9x+126-259=0
We add all the numbers together, and all the variables
7x-133=0
We move all terms containing x to the left, all other terms to the right
7x=133
x=133/7
x=19
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