solve a + 2b =2d
a= 2c
3a + 2b =6c + d
if d = 1
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a=2c
a+2b=2d
2c+2b=2......1
6c+2b=6c+1.....2
2b=1
b=1/2
now apply b on 1,
2(c+1/2)=2
c+1/2=1
c=1/2
a=2×c
a=2×1/2
a=1
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