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5x-x+30=-2x-30
We move all terms to the left:
5x-x+30-(-2x-30)=0
We add all the numbers together, and all the variables
4x-(-2x-30)+30=0
We get rid of parentheses
4x+2x+30+30=0
We add all the numbers together, and all the variables
6x+60=0
We move all terms containing x to the left, all other terms to the right
6x=-60
x=-60/6
x=-10
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