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9x+10=-20x
We move all terms to the left:
9x+10-(-20x)=0
We get rid of parentheses
9x+20x+10=0
We add all the numbers together, and all the variables
29x+10=0
We move all terms containing x to the left, all other terms to the right
29x=-10
x=-10/29
x=-10/29
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