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a). a+b+c = 2x + 7y + 9z (tetap)
b). 2a^ + 3b + c^ = 2 x 2x^ + 3 x 7y + 9z^
= (2 x 2x^) + (3 x 7y) + 9z^
= 4x^ + 21y + 9z^
*ket :
^= pangkat 2