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x in (-oo:+oo)
0.766 = x/4 // - x/4
0.766-(x/4) = 0
0.766-1/4*x = 0 // - 0.766
-1/4*x = -0.766 // : -1/4
x = -0.766/(-1/4)
x = 3.064
x = 3.064
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