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25W +20(6,5) = 45(7)
25W + 130 = 315
25W = 315 - 130
25W = 185
W = 185/25
W = 7,4
rata wanita =7,4
7=25 x +130/ 45
7 X 45 =25x +130
315= 25x +130
315-130 = 25x
185 =25x
7,4 = x