if the answer is......75

75+0=75
75-0=75
45+30=75
70+5=75
55+20=75
71+4=75
72+3=75
73+2=75
75x1=75
66+9=75
72+1+2=75
65+5+5=75
60+15=75
85-10=75
95-20=75
105-30=75
115-40=75
80-5=75
110-35=75
120-45=75