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b) 4x + 7
c) -4x + 12
d) -3x + 12
e) 5x^2 - 2y^2 + xy
caramya tinggal dihitung sesuai variabel masing masing
misalkan a + 2a + b
yang ditambah hanya yg variabelnya sama
jadi jawabannya 3a + b