Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "equals" etc. Also use ^ to indicate powers (eg x-squared = x^2).
In this case, there is no operator between -6x and 9.
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63
3/Y+7\Y=9 =>Y=10\9
14
Density is weight divided by volume. The weight is found with a scale, and the volume is the length of any edge multiplied by itself twice, for example, if the edge is 3" long, 3"x3"x3" = 9 cubic inches.
9 + t/12 = -3 t/12 = -12 t = -144