x-8:15x=4 1:5
15:15x-8:15x=21:5
7:15x=21:5
x=21*15:5*7
x=9
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x-8:15x=4 1:5
15:15x-8:15x=21:5
7:15x=21:5
x=21*15:5*7
x=9