Question

Answer 1

a)\(x=\dfrac{4}{9}--\dfrac{5}{9}=1\)
b)\(x=\dfrac{7}{21}--\dfrac{9}{21}=\dfrac{16}{21}\)
c)\(x=-\dfrac{11}{12}-\dfrac{1}{12}=-1\)

Answer 2

a)

\(-\dfrac{5}{9}+x=\dfrac{4}{9}\)

\(x=\dfrac{4}{9}-\left(-\dfrac{5}{9}\right)\)

\(x=1\)

b)

\(\dfrac{-3}{7}+x=\dfrac{1}{3}\)

\(x=\dfrac{1}{3}-\dfrac{-3}{7}\)

\(x=\dfrac{7}{21}-\dfrac{-9}{21}\)

\(x=\dfrac{16}{21}\)

c)

\(\dfrac{1}{12}+x=\dfrac{-11}{12}\)

\(x=\dfrac{-11}{12}-\dfrac{1}{12}\)

\(x=-1\)

Answer 3

\(a,x=\dfrac{4}{9}-\left(-\dfrac{5}{9}\right)=\dfrac{4}{9}+\dfrac{5}{9}=\dfrac{9}{9}=1\)

\(b,x=\dfrac{1}{3}-\left(-\dfrac{3}{7}\right)=\dfrac{1}{3}+\dfrac{3}{7}=\dfrac{16}{21}.\)

\(c,x=-\dfrac{11}{12}-\dfrac{1}{12}=\dfrac{-12}{12}=-1\)