10 3/4 = 10.75
10.75 · (x - 7) = 8.6
x - 7 = 8.6 : 10.75
x - 7 = 0.8
x = 7.8
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10 3/4 = 10.75
10.75 · (x - 7) = 8.6
x - 7 = 8.6 : 10.75
x - 7 = 0.8
x = 7.8