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x in (-oo:+oo)
9.3 = x/4 // - x/4
9.3-(x/4) = 0
9.3-1/4*x = 0 // - 9.3
-1/4*x = -9.3 // : -1/4
x = -9.3/(-1/4)
x = 37.2
x = 37.2
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