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=
CD = ×
=
2A-B= -
=
2A-B=CD
=
-10 = -2c-4
-2c = -10 + 4
-2c = -6
c =
c=3
-b+7 = -4
-b= -4 - 7
b = 11
4-a = -b+9
4-a = -11 +9 -4
a = 6
jadi a + b + c = 6 +11+ 3
= 20
maaf kalau lama dan ada kekeliruan