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x+\frac{8}{7}=8\times \frac{8}{7}
Multiply both sides by \frac{8}{7}, the reciprocal of \frac{7}{8}.
x+\frac{8}{7}=\frac{8\times 8}{7}
Express 8\times \frac{8}{7} as a single fraction.
x+\frac{8}{7}=\frac{64}{7}
Multiply 8 and 8 to get 64.
x=\frac{64}{7}-\frac{8}{7}
Subtract \frac{8}{7} from both sides.
x=\frac{64-8}{7}
Since \frac{64}{7} and \frac{8}{7} have the same denominator, subtract them by subtracting their numerators.
x=\frac{56}{7}
Subtract 8 from 64 to get 56.
x=8
Divide 56 by 7 to get 8.