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2r + s - 8 = 0
2 (-5) + s - 8 = 0
-10 + s - 8 = 0
s = 10 + 8
s = 18
Jadi, 2r + s - 8 = 0
2 (-5) + 18 - 8 = 0
-10 + 10 = 0
0 = 0