f(x)=2x-1
g(x)=x+1
3 2/5+ 1 3/7
60/90-30/90
4/6-5/18
-81 3/2=
3(2a-4)+6\left(d-3)=30
-\dfrac{1}{4} \times \left(-\dfrac{7}{9}\right)
3(2a-4)+6(d-3)=30
simplifiy 2rX3s
