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x in (-oo:+oo)
x+x-(2/5)+2/3 = 4 // - 4
x+x-(2/5)+2/3-4 = 0
x+x-2/5+2/3-4 = 0
2*x-56/15 = 0 // + 56/15
2*x = 56/15 // : 2
x = 56/15/2
x = 28/15
x = 28/15
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