can you solve (7-42a)(3/7)

Question

I am having a test on this tomorrow and I can't figure it out any way or anywhere. Please help me! This could determine which high school I am qualified to attend.

Thank you,

      Julia

Answer 1

(3/7)*(7-42a)=3*(1-6a)

=3-18a

Answer 2

(7-42a) x (3/7) = 3 - 18a

a = -3/18