4分之3X+3*0.8=7.5

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4分之3X+3*0.8=7.5
4分之3X+3*0.8=7.5

4分之3X+3*0.8=7.5
4分之3X+3*0.8=7.5
0.75X+2.4=7.5
0.75X=7.5-2.4=5.1
X=5.1÷0.75
X=6.8

3/4x+3*0.8=7.5
3/4x=7.5-2.4
0.75x=5.1
x=6.8

6.8

0.75x + 2.4 = 7.5
0.75x = 5.1
75x = 510
x = 6.8