Ineed to know if any one can me explain to my son how multi- step equations work like this (8v-7)=12-4v

8(8v-7)=12-4v

multiply the bracket by 8

(8)(8v)=64v

(8)(-7)=-56

64v-56=12-4v

move -4v to the other side

sign changes from -4v to +4v

64v+4v-56=12+4v

68v-56=12+4v-4v

68v-56=12

move -56 to the other side

sign changes from -56 to +56

68v-56+56=12+56

68v=12+56

68v=68

divide both sides by 68 to get v by itself

68v/68=68/68

cross out 68 and 68, divide by 68

then becomes 1*1*v=v

v=68/68

Divide the fraction by 68

68/68=1, 68/68=1

1*1=1

v=1

total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98