Question

Answer 1

9: \(x-\frac{-1}{2}=-\frac94\)

=>\(x=-\frac94+\frac{-1}{2}=\frac{-9}{4}+\frac{-2}{4}=-\frac{11}{4}\)

10: \(x-\left(-\frac{5}{11}-\frac{9}{11}\right)=\frac{2}{11}\)

=>\(x-\frac{-14}{11}=\frac{2}{11}\)

=>\(x=\frac{2}{11}+\frac{-14}{11}=-\frac{12}{11}\)

11: \(x-\frac{7}{19}=\frac{12}{11}+\frac{12}{19}\)

=>\(x=\frac{12}{11}+\frac{12}{19}+\frac{7}{19}\)

=>\(x=\frac{12}{11}+1=\frac{23}{11}\)

12: \(\frac{1}{10}-\left(\frac{5}{12}-\frac{1}{15}\right)=x-1\)

=>\(x-1=\frac{6}{60}-\left(\frac{25}{60}-\frac{4}{60}\right)=\frac{6}{60}-\frac{21}{60}=\frac{-15}{60}=-\frac14\)

=>\(x=-\frac14+1=-\frac34\)