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8.3*x-9.1 = x/6.5 // - x/6.5
8.3*x-(x/6.5)-9.1 = 0
8.3*x-0.15384615*x-9.1 = 0
8.14615385*x-9.1 = 0 // + 9.1
8.14615385*x = 9.1 // : 8.14615385
x = 9.1/8.14615385
x = 1.1170916
x = 1.1170916
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