x:3.6=7/8:0.75x:3.6=7/8:0.75

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x:3.6=7/8:0.75x:3.6=7/8:0.75
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x:3.6=7/8:0.75x:3.6=7/8:0.75
x:3.6=7/8:0.75
x:3.6=7/8:0.75

x:3.6=7/8:0.75x:3.6=7/8:0.75
x:3.6=7/8:0.75
0.75x=3.6x7/8
0.75x=3.6x0.875
0.75x=3.15
x=3.15÷0.75
x=4.2

x:3.6=7/8:0.75
0.75x=3.6×7/8
x=3.6×7/8÷0.75
x=4.2

x:3.6=7/8:0.75
x=3.6×7/8÷0.75=4.2

x:3.6=7/8:0.75
0.75x=3.6×7/8
0.75x=3.15
x=3.15÷0.75
x=4.2