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-5-4x+9=7+9
We move all terms to the left:
-5-4x+9-(7+9)=0
We add all the numbers together, and all the variables
-4x-5+9-16=0
We add all the numbers together, and all the variables
-4x-12=0
We move all terms containing x to the left, all other terms to the right
-4x=12
x=12/-4
x=-3
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