10 points solve ASAP Solve for x: -8x + 10 = 82

a
x = 9

b
x = -9

c
x = 92/8

d
x = -92/8

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?