5(x+3)=3(2x-1)
**distribute
5x+15=6x-3
-5x -5x
**get like term together
15=x-3
+3 +3
**get x alone on one side of the equation
18=x
check your work by replacing the variable x with 18
5(18+3)=3(2·18 -1)
5·21=3·35
105=105 yes!
So, the number you are looking for is 18