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5x+15=-30x-20
We move all terms to the left:
5x+15-(-30x-20)=0
We get rid of parentheses
5x+30x+20+15=0
We add all the numbers together, and all the variables
35x+35=0
We move all terms containing x to the left, all other terms to the right
35x=-35
x=-35/35
x=-1
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