12x +7y
=13
15+5y =23
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12x+7y=13
15+5y=23
5y=23-15
5y=8
y=8/5
12x+7(8/5)=13
12x+56/5=13
36x+56=65
36x=65-56
36x=9
x=1/4
i hope this is right ans
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