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-19=4x+9
We move all terms to the left:
-19-(4x+9)=0
We get rid of parentheses
-4x-9-19=0
We add all the numbers together, and all the variables
-4x-28=0
We move all terms containing x to the left, all other terms to the right
-4x=28
x=28/-4
x=-7
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