Jawabanmu

2014-03-26T17:02:41+07:00
6x+30 - (9x-18) = -2x+8
6x
+30 - 9x + 18 = -2x+8
               -3x+48=-2x+8
                  48-8=2x+3x
                     40=5x
 \frac{40}{5} =x
8=x
yang -2x nya itu kok jadi 2x ? seharusnya tetep -2x
oh iya sorry, salah baca :D
gak papa ^_^
2014-03-26T17:15:48+07:00
6x+30-(9x-18) = -2x+8
⇔6x+30-9x+18 = -2x+8
⇔6x-9x+2x = 8-30-18
⇔-1x = -40
⇔x =  \frac{-40}{-1}
⇔x = 40