I'm new in algebra and wanted some help.
First minus the 300 to get the x by its self,
10x + 300 = 0 is the same as 10x + 300 -300 = 0 - 300
Then you are left with 10x = - 300
Divide by 10 to get the x by itself,
10x/10 = -300/10
This will give you x = -30
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