If w = < 3.5, -6> and z = < -1.5, -4> , what is the resulting vector for 2w − z?

We have the following vectors:
 w = <3.5, -6>
 z = <-1.5, -4>
 We want to find:
 2w - z
 Substituting we have:
 2w - z = 2 (<3.5, -6>) - (<-1.5, -4>)
 Rewriting we have:
 <7, -12> + <1.5, 4>
 Adding component to component:
 <(7 + 1.5), (-12 + 4)>
 <8.5, -8>
 
 The resulting vector is:
 <8.5, -8>

Idont knowgfdhdhfhggg.