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x in (-oo:+oo)
5/7 = x/5.3 // - x/5.3
5/7-(x/5.3) = 0
5/7-0.18867925*x = 0
5/7-0.18867925*x = 0 // - 5/7
-0.18867925*x = -5/7 // : -0.18867925
x = -5/7/(-0.18867925)
x = 3.78571417
x = 3.78571417
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