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= 2 (5x-3x) + 3
= 10x - 6x + 3
= 4x + 3
1b. f(g(x))
= f (2x + 3)
= 5(2x+3) - 3(2x+3)
= 10x + 15 - 6x + 9
= 4x + 24
semoga benar