Emilee
The error is in the 2nd line
9x+18+3x=1
9x+18=(-2)
9x=(-20)
x= (-20/9)
9x+18=(-2)
9x=(-20)
x= (-20/9)
You should have
9x+18+3x=1
12x+18=1
9x=(-17)
x= (-17/9)
12x+18=1
9x=(-17)
x= (-17/9)
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