Do the multiplication and simplify
7(x-5) = 21
x-5 =
pl

Step-by-step explanation:

7(x-5)=21

7x-35=21

7x=21+35

7x=56 /:7

x=8

x-5

8-5= 3

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2