Answer :
3(2x - 5) = 9(10 - x)
distribute
6x - 15 = 90 - 9x
+ 15 + 15
6x = 105 - 9x
+ 9x + 9x
15x = 105
—— ——
15 15
x = 7
distribute
6x - 15 = 90 - 9x
+ 15 + 15
6x = 105 - 9x
+ 9x + 9x
15x = 105
—— ——
15 15
x = 7