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x in (-oo:+oo)
49^2*x = 1/7 // - 1/7
49^2*x-(1/7) = 0
49^2*x-1/7 = 0
2401*x-1/7 = 0 // + 1/7
2401*x = 1/7 // : 2401
x = 1/7/2401
x = 1/16807
x = 1/16807
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