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= 4.2x + 4.5
= 8x + 20
Cara 1:
(9 - 4) (2x + 5) = 18x + 45 - 8x - 20
= 18x - 8x +45 - 20
= 10x +25
Cara 2:
9-4 (2x+5) = 5(2x+5)
= 10x+25.
Sama kann..
Semoga Bermanfaat..