Define a variable and write an equation for each situation. solve each equation to answer the question.

eli took the fleet of 8 vans for oil changes. all of the vans needed windshield wipers, which cost $42 per van. what is the cost of each oil change

o = cost of each oil change

for my equation i made,
8o+8(42)=432

but cant figure out how to solve it

(9th grade alg 1)
plz work out the problem, thnx : -)