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p(2) = a (2) - b
b = 2a
masukan ke soal
p(4) - 2b = ?
{a (4) - b} - 2b
4a - 3b
4a - 3 (2a)
4a - 6a
-2a
a = - 1/2
masukan ke p ( 2 ) = -1/2 x 2 - b = 10
= -1 - b = 10
= -b = 11
= b = - 11
masuk lg ke p(4)
4 ( -1/2) - 3 (-11) = 31