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x+20+2x=-10-2x-5
We move all terms to the left:
x+20+2x-(-10-2x-5)=0
We add all the numbers together, and all the variables
x+2x-(-2x-15)+20=0
We add all the numbers together, and all the variables
3x-(-2x-15)+20=0
We get rid of parentheses
3x+2x+15+20=0
We add all the numbers together, and all the variables
5x+35=0
We move all terms containing x to the left, all other terms to the right
5x=-35
x=-35/5
x=-7
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