If i am correct i think it is 3× = 78 +×-2 idk but i think it that hopefully u get it right :)
Step-by-step explanation:
the formula is too long so the link is below:
https://www.geteasysoloution.com/1/3x+12=x-4
direct proportion y=kx , k is constant and k does not equal to 0.
17.5=k(21)
k=5/6
when x =39
y=5/6 ×39
y=32.5
You need to add 2+3+4
divid into 1/3
and your answer is 0.037 longated
