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2 .  5 y-1

Note 20= 22  .   51

So 20 (2x+3)= ( 22  .   51 )  2x+3

                      =2 4x+6    .   5 2x+3

Comparing powers of:

Factor 2: x = 4x +6 –> x = -2#

Factor 5: y-1 = 2x +3

y= 2(-2)+3 +1

Y=0#

 

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