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x in (-oo:+oo)
-3/4 = (-2/3)*x-(2/5) // - (-2/3)*x-(2/5)
2/5-((-2/3)*x)-3/4 = 0
(2/3)*x-3/4+2/5 = 0
2/3*x-7/20 = 0 // + 7/20
2/3*x = 7/20 // : 2/3
x = 7/20/2/3
x = 21/40
x = 21/40
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