5X(x-6.5)=1.

1. Divide both sides of the equation by 5,
5×（x—6.5）÷5=1.7÷5
x-6.5=0.34
2. Add 6.5 to both sides of the equation
x-6.5+6.5=0.34+6.5
x=6.85

1 / 2 {1 / 3 [1 / 4 (1 / 5x-1) - 6 + 3} = 1 solution equation

1/2{1/3[1/4(1/5x-1)-6]+3}=1
1/3[1/4(1/5x-1)-6]+3=2
1/3[1/4(1/5x-1)-6]=-1
1/4(1/5x-1)-6=-3
1/4(1/5x-1)=3
1/5x-1=12
1/5x=13
x=65

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