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x in (-oo:+oo)
4/3 = x/2.1 // - x/2.1
4/3-(x/2.1) = 0
4/3-0.47619048*x = 0
4/3-0.47619048*x = 0 // - 4/3
-0.47619048*x = -4/3 // : -0.47619048
x = -4/3/(-0.47619048)
x = 2.79999997
x = 2.79999997
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