6,55 (18 + a) = 115 + 8a
117,9 + 6,55a = 115 + 8a
2,9 = 1,45 a
a =2
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=8+20+36+21+8a+30 : (18+a) = 6,55
=115+8a : 18+a = 6,55
115+8a = 6,55(18+a)
115+8a = 117,9+6,55a
8a-6,55a = 117,9-155
1,45a = 2,9
=2
jawabannya 2
6,55 (18 + a) = 115 + 8a
117,9 + 6,55a = 115 + 8a
2,9 = 1,45 a
a =2