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2x + 3 (y -x)
= 2x +3y - 3x
= -x + 3y
soal 2
2a -4(a-b)
= 2a -4a + 4b
= -2a + 4b
2x+3y-3x
-x+3y
2a-4(a-b)
2a-4a+4b
-2a+4b