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2. 6x+4y - 4x-9y = 4y+9y - 6x-4x = 13y - 2x
3. 8x-6x - 4 +7 = 2x-3
2. 2(3x + 2y) - 4(x - 5y)
=6x + 4y - 4x + 20y
=6x - 4x + 4y + 20y
= 2x + 24 y
3. 8x - 4 - 6x + 7
= 8x - 6x - 4 +7
= 2x + 3
4. soalnya maksudnya gimana kurang ngerti