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2x+20=-8x-30
We move all terms to the left:
2x+20-(-8x-30)=0
We get rid of parentheses
2x+8x+30+20=0
We add all the numbers together, and all the variables
10x+50=0
We move all terms containing x to the left, all other terms to the right
10x=-50
x=-50/10
x=-5
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