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x in (-oo:+oo)
0.75 = x/28 // - x/28
0.75-(x/28) = 0
0.75-1/28*x = 0 // - 0.75
-1/28*x = -0.75 // : -1/28
x = -0.75/(-1/28)
x = 20.99999748
x = 20.99999748
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