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2*x-(4/10) = (2*x)/20 // - (2*x)/20
2*x-((2*x)/20)-(4/10) = 0
2*x+(-1/10)*x-2/5 = 0
19/10*x-2/5 = 0 // + 2/5
19/10*x = 2/5 // : 19/10
x = 2/5/19/10
x = 4/19
x = 4/19
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