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x in (-oo:+oo)
10.5/13 = x/4 // - x/4
10.5/13-(x/4) = 0
0.80769231-1/4*x = 0 // - 0.80769231
-1/4*x = -0.80769231 // : -1/4
x = -0.80769231/(-1/4)
x = 3.23076924
x = 3.23076924
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