Jawabanmu

2014-09-04T19:08:59+07:00
5(3x-9) - 2(4x+5)
15x-45-8x-10
15x-8x-45-10
7x-55
2014-09-04T19:11:20+07:00
2{4x+5}-5{3x-9}=8x+10-15x+45=15x-8x+10+45=7x+55