0.4=(2.1-x)/1.3

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Solution for 0.4=(2.1-x)/1.3 equation: 


x in (-oo:+oo)

0.4 = (2.1-x)/1.3 // - (2.1-x)/1.3

0.4-((2.1-x)/1.3) = 0

0.4-0.76923077*(2.1-x) = 0

0.4-0.76923077*(2.1-x) = 0

0.76923077*x-1.215384617 = 0

0.76923077*x-1.215384617 = 0

0.76923077*x-1.215384617 = 0 // + 1.215384617

0.76923077*x = 1.215384617 // : 0.76923077

x = 1.215384617/0.76923077

x = 1.58

x = 1.58

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