Answer:
[tex]9c+5.9d-7.9[/tex]
Step-by-step explanation:
[tex]-\left(-9c-5.9d+7.9\right)[/tex]
[tex]\mathrm{Distribute\:parentheses}[/tex]
[tex]=-\left(-9c\right)-\left(-5.9d\right)-\left(7.9\right)[/tex]
[tex]\mathrm{Apply\:minus-plus\:rules}[/tex]
[tex]-\left(-a\right)=a,\:\:\:-\left(a\right)=-a[/tex]
[tex]=9c+5.9d-7.9[/tex]
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