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(2 a+2b) = ( a -8 )
11 10 11 b+5c
2=a Maka a+b+c adalah :
= 2+(-5)+3
a+2b=-8 10 = b+5c = 0
2+8 = -2b 10 = -5 +5c
10 = -2b 10+5 = 5c
-5 = b 15 = 5c
3=c