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x in (-oo:+oo)
(-2/3)*x-((1/2)*x)+2/5 = -23/30 // + -23/30
(-2/3)*x-((1/2)*x)+2/5-(-23/30) = 0
(-2/3)*x+(-1/2)*x+2/5+23/30 = 0
7/6-7/6*x = 0 // - 7/6
-7/6*x = -7/6 // : -7/6
x = -7/6/(-7/6)
x = 1
x = 1
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