(x,y) = (2,1)
ax+by = 1
cx+dy = 2
2a+b = 1 ---> 2a+b-1 = 0
2c+d = 2 ---> 2c+d-2 = 0
2a+b-1= 2c+d-2
2a+b = 2c+d-3
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(x,y) = (2,1)
ax+by = 1
cx+dy = 2
2a+b = 1 ---> 2a+b-1 = 0
2c+d = 2 ---> 2c+d-2 = 0
2a+b-1= 2c+d-2
2a+b = 2c+d-3