-8
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With great difficulty not knowing whether or not it is an equation or an expression in the absence of signs.
It is an expression that can be simplified to: 12-5d
To simplify 8d -5 +7d -9d, combine the numbers with the ds and don't forget the -5. 8d + 7d - 9d = 6d Simplified, it is 6d - 5.
x=12
It can be simplified to: 14d+19e
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