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0=(30x)(30x)-15x
We move all terms to the left:
0-((30x)(30x)-15x)=0
We add all the numbers together, and all the variables
-(-15x+30x30x)+0=0
We add all the numbers together, and all the variables
-(-15x+30x30x)=0
We get rid of parentheses
15x-30x30x=0
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