7x-4=31
7x=31+4
7x=35
x=35/7=5
4y+8=24
4y=24-8
4y=16
y=16/4=4
Hence, x=5;y=4
-4=3 (x/2 -7) multiply everything by 2 to get the fraction out
-8=9 (x-7) then subtract 9 from -8 to get 1
1= x-7 add 7 to each side
8=x
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