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(1/5)*(10*x-9) = 8 // - 8
(1/5)*(10*x-9)-8 = 0
1/5*(10*x-9)-8 = 0
1/5*(10*x-9)-8 = 0
2*x-49/5 = 0
2*x-49/5 = 0
2*x-49/5 = 0 // + 49/5
2*x = 49/5 // : 2
x = 49/5/2
x = 49/10
x = 49/10
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