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x in (-oo:+oo)
9/10 = x/4 // - x/4
9/10-(x/4) = 0
9/10-1/4*x = 0 // - 9/10
-1/4*x = -9/10 // : -1/4
x = -9/10/(-1/4)
x = 18/5
x = 18/5
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