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4x=8y+4
x=2y+1
8y+2x+1=4x+3y
2x=5y+1
x=2,5y+0,5
2y+1=2,5y+0,5
0,5y=0,5
y=1
x=2*1+1=3
a=6*3-3=15
L=3a=3*15=45