Jawabanmu

2014-04-05T23:26:09+07:00
2/5X-7=1/2X-15/2 4X-70=5X-75(semuanya dikali 10) -5X+4X=-75+70 -X=-5 X=5 maka 2/5X=2. 1/2X=5/2=2,5 masukin ke dalam soal 2-7=2,5-7,5 hasilnya=-5
2014-04-05T23:27:08+07:00
2/ 5x-7 = 1/2 (x - 15)
4/5x - 7 = x - 15
4 = x - 15 (5x - 7)
4 = 5x² - 7x - 75x + 105
4 = 5x² - 82x + 105
0 = 5x² - 82x + 105 - 4
0 = 5x² - 82x + 101