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7*x-(9/10) = 761/10 // - 761/10
7*x-(9/10)-(761/10) = 0
7*x-9/10-761/10 = 0
7*x-77 = 0 // + 77
7*x = 77 // : 7
x = 77/7
x = 11
x = 11
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