3 X-1/5 X=7/2

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3X-1/5X=7/23X-1/5X=7/23X-1/5X=7/2(3-1/5)X=7/214/5X=7/2X=7/2÷14/5X=5/415x/5-x/5=7/214x/5=7/2x=5/414/5

3 X-1/5 X=7/2
3 X-1/5 X=7/2

3 X-1/5 X=7/2
(3-1/5)X=7/2
14/5X=7/2
X=7/2÷14/5
X=5/4

15x/5-x/5=7/2
14x/5=7/2
x=5/4

14/5x=7/2
x=5/4

我也不好╮(╯﹏╰）╭