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-30x-6=-9x-3
We move all terms to the left:
-30x-6-(-9x-3)=0
We get rid of parentheses
-30x+9x+3-6=0
We add all the numbers together, and all the variables
-21x-3=0
We move all terms containing x to the left, all other terms to the right
-21x=3
x=3/-21
x=-1/7
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