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X in (-oo:+oo)
1.3 = (210*X)/64300 // - (210*X)/64300
1.3-((210*X)/64300) = 0
(-21/6430)*X+1.3 = 0
1.3-21/6430*X = 0 // - 1.3
-21/6430*X = -1.3 // : -21/6430
X = -1.3/(-21/6430)
X = 398.04772898
X = 398.04772898
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