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1.55*x = 1/2.12 // - 1/2.12
1.55*x-(1/2.12) = 0
1.55*x-0.47169811 = 0
1.55*x-0.47169811 = 0 // + 0.47169811
1.55*x = 0.47169811 // : 1.55
x = 0.47169811/1.55
x = 0.30432136
x = 0.30432136
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