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4*x-((2/5.1)/2) = 0
4*x-0.19607843 = 0
4*x-0.19607843 = 0 // + 0.19607843
4*x = 0.19607843 // : 4
x = 0.19607843/4
x = 0.04901961
x = 0.04901961
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