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4x+5=-9x-20
We move all terms to the left:
4x+5-(-9x-20)=0
We get rid of parentheses
4x+9x+20+5=0
We add all the numbers together, and all the variables
13x+25=0
We move all terms containing x to the left, all other terms to the right
13x=-25
x=-25/13
x=-1+12/13
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