5a+17=8a+15 maka nilai 3x+6 adalah= 3(x-4)+5=17 maka nilai x+7 adalah

[tex]5a + 17 = 8a + 15 \\ 8a - 5a = 17 - 15 \\ 3a = 2 \\ a = \frac{3}{2} \\ maka \: nili \: 3a + 6 = 3( \frac{3}{2} ) + 6 \\ = \frac{9}{2} + 6 \\ = \frac{9}{2} + \frac{12}{2} \\ = \frac{21}{2} \\ = 10 \frac{1}{2} \\ \\ 3(x - 4) + 5 = 17 \\ 3x - 12 + 5 = 17 \\ 3x = 17 + 12 - 5 \\ 3x = 24 \\ x = \frac{24}{3} \\ x = 8 \\ maka \: x + 7 = 8 + 7 \\ = 15[/tex]