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-9=4x+11
We move all terms to the left:
-9-(4x+11)=0
We get rid of parentheses
-4x-11-9=0
We add all the numbers together, and all the variables
-4x-20=0
We move all terms containing x to the left, all other terms to the right
-4x=20
x=20/-4
x=-5
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