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x in (-oo:+oo)
x-(2/5) = (1/2)*x-37/55 // - (1/2)*x-37/55
x-((1/2)*x)-(2/5)-(-37/55) = 0
x+(-1/2)*x-2/5+37/55 = 0
1/2*x+3/11 = 0 // - 3/11
1/2*x = -3/11 // : 1/2
x = -3/11/1/2
x = -6/11
x = -6/11
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