3/4x-3.6=13/5x3/4x-3.6=1又3/5x
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3/4x-3.6=13/5x3/4x-3.6=1又3/5x3/4x-3.6=13/5x3/4x-3.6=1又3/5x3/4x-3.6=13/5x3/4x-3.6=1又3/5x0.75x-3.6=1.6
3/4x-3.6=13/5x3/4x-3.6=1又3/5x
3/4x-3.6=13/5x
3/4x-3.6=1又3/5x
3/4x-3.6=13/5x3/4x-3.6=1又3/5x
0.75x-3.6=1.6x
-3.6=0.85x
x=-72/17
到计算机上面算