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x in (-oo:+oo)
x+x-(40/9)+7/2 = -4 // + 4
x+x-(40/9)+7/2+4 = 0
x+x-40/9+7/2+4 = 0
2*x+55/18 = 0 // - 55/18
2*x = -55/18 // : 2
x = -55/18/2
x = -55/36
x = -55/36
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