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b 9+4x-1 = 4x+8
c. 4-8 = -4 ada x jdinya -4x+12
d.-2x-1x+7+5= -3x+12
e.3x2+2x2+3y2-5y2-5xy+6xy = 5x2-2y2+xy
ket : x2 di baca x pangkat 2