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3x+3=-8x-30
We move all terms to the left:
3x+3-(-8x-30)=0
We get rid of parentheses
3x+8x+30+3=0
We add all the numbers together, and all the variables
11x+33=0
We move all terms containing x to the left, all other terms to the right
11x=-33
x=-33/11
x=-3
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