Jawabanmu

2014-08-28T17:48:19+07:00
7(1-2x)+9(-2x-1)
7 -14x + (-18x) -9 =
-14x + (-18x) = -7 + 9
-32x = 3
x = 
 \frac{-32}{-3}
2014-08-28T17:52:34+07:00
(7×1)(7×-2x)+(9×-2x)(9×-1)    --------> × artinya dikali lho..
= 7-14x+(-18x-9)
= 7-14x+1(-18x-9) ------------> kalikan satu agar bilangan yang dikurung dapat          = 7-14x-18x-9                          dipecah 
= -14x-18x+7-9
= -32x+ (-2)
=-32x+ 1(-2)
=-32x-2,           

jangan lupa visit saya....

oh iya, 0=-32x-2 -> 2=-32x -> 2/-32=x -> x=-1/16