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1. 2x+4
2. 2x-4
3. 4x-5y-7x+3y
jadi:
4x-7x-5y+3y= -3x-2y
4. -2a-3b+4a-26
jadi:
-2a+4a-3b-26= 2a-3b-26
5. (x+2) (x-7)
jadi:
x(pangkat dua) -7x+2x-14
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