Answer:
30
Step-by-step explanation:
you just multiply both the 7 and the 3 by ten
You need to subtract then divide
Most linear systems you will encounter will have exactly one solution. However, it is possible that there are no solutions, or infinitely many. (It is not possible that there are exactly two solutions.) The word unique in this context means there is a solution, and it's the only one.
Let x = the number
7x = 280
x = 280/7
x = 40
hope this helps :)