Possibly 21, but it is difficult to be sure because the browser does not support symbols and so we cannot see exactly what you asked.
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x=-24
If: x+3+6x+9 = 0 then 7x+12 = 0 So: 7x = -12 and x = -12/7
no...why would it.... it equals 2x+9
-9
-10x+3 = -x+12 -10x+x = 12-3 -9x = 9 x = -1