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10x+20x-8+1=-9+1-8
We move all terms to the left:
10x+20x-8+1-(-9+1-8)=0
We add all the numbers together, and all the variables
10x+20x-8+1-(-16)=0
We add all the numbers together, and all the variables
30x+9=0
We move all terms containing x to the left, all other terms to the right
30x=-9
x=-9/30
x=-3/10
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