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x in (-oo:+oo)
2*x+20 = 4/7 // - 4/7
2*x-(4/7)+20 = 0
2*x-4/7+20 = 0
2*x+136/7 = 0 // - 136/7
2*x = -136/7 // : 2
x = -136/7/2
x = -68/7
x = -68/7
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