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x in (-oo:+oo)
7.2 = x/2.1 // - x/2.1
7.2-(x/2.1) = 0
7.2-0.47619048*x = 0
7.2-0.47619048*x = 0 // - 7.2
-0.47619048*x = -7.2 // : -0.47619048
x = -7.2/(-0.47619048)
x = 15.11999988
x = 15.11999988
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