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5*3-7*0=15
15-0=15
15=15
(10,5)
5*10-7*5=15
50-35=15
15=15
b) (0,0)
12*0-7*0=0
0-0=0
0=0
(7,12)
12*7-7*12=0
84-84=0
0=0
c) (10,6)
11*10-6=104
110-6=104
104=104
(-9,-203)
11*(-9)-(-203)=104
-99+203=104=104