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x in (-oo:+oo)
(-2/3)*x+2*x = (1/2)*x+2.5 // - (1/2)*x+2.5
(-2/3)*x+2*x-((1/2)*x)-2.5 = 0
(-2/3)*x+2*x+(-1/2)*x-2.5 = 0
5/6*x-2.5 = 0 // + 2.5
5/6*x = 2.5 // : 5/6
x = 2.5/5/6
x = 3.00000001
x = 3.00000001
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