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