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x in (-oo:+oo)
x+x+1/2+1/3 = 7 // - 7
x+x+1/2+1/3-7 = 0
2*x-37/6 = 0 // + 37/6
2*x = 37/6 // : 2
x = 37/6/2
x = 37/12
x = 37/12
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