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x in (-oo:+oo)
1/(7^2)-((3/7)*x) = 0
(-3/7)*x+1/(7^2) = 0
1/49-3/7*x = 0 // - 1/49
-3/7*x = -1/49 // : -3/7
x = -1/49/(-3/7)
x = 1/21
x = 1/21
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