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x in (-oo:+oo)
3/4.5 = x/2.5 // - x/2.5
3/4.5-(x/2.5) = 0
3/4.5-0.4*x = 0
0.66666667-0.4*x = 0 // - 0.66666667
-0.4*x = -0.66666667 // : -0.4
x = -0.66666667/(-0.4)
x = 1.66666668
x = 1.66666668
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