Question 943166
B= Bernie's age;B+1=2(B-7) (B+1 is Bernie next year, B-7= Bernie 7 yrs ago)
B+1=2B-14 add 14 to each side
B+1+14=2B-14+14
B+15=2B subtract B from each side
B+15-B=2B=B
15=B ANSWER Bernie is 15
CHECK 
B+1=2(B-7)
15+1=2(15=7)
16=2(8)
16=16