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0=3x^+18x+15
We move all terms to the left:
0-(3x^+18x+15)=0
We add all the numbers together, and all the variables
-(3x^+18x+15)=0
We get rid of parentheses
-3x^-18x-15=0
We add all the numbers together, and all the variables
-21x-15=0
We move all terms containing x to the left, all other terms to the right
-21x=15
x=15/-21
x=-5/7
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