X/5 = 7; 35 points (just adding more words so i can submit this)
If 39 = (1 3/10)b, we could simplify this by writing 39 - (13/10)b.
Solve this for b by mult. both terms by (10/13):
(10*39)
----------- = (10/13)(13/10)b. Then b = 30 (answer)
13
Step-by-step explanation:
In the second step while opening the bracket, instead of 'a', there should be - 4a.
Step-by-step explanation: