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b)5x-3y+1+2y-x-7+12+6y-15x = -11x+5y+6
c)a+10b-g+3a-5b+4c+2c+b-6 = 4a+6b-g+6c-6
d)8xy-2yz+2xy-z+6yz+9yz-7yz-3z = 10xy+6yz-4z