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[5*x]/8=[18-5x]/12 (*24)
24[5*x]/8=24[18-5x]/12
3[5*x]=2[18-5x]
15x=35-10x
15x+10x=35
25x=35
x=35/25
x=1i2/5
3x/2+x/6=2x/9+13(*18)
18[3x/2]+18[x/6]=18[2x/9]+18[13]
27x+3x=4x+234
30x-4x=234
26x=234
x=9
4x/9-5x/12=11(*36)
36[4x/9]-36[5x/12]=36[11]
16x-15x=396
x=396