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x in (-oo:+oo)
1.28*((7.44-x)/1.28) = 0
(1.28*(7.44-x))/1.28 = 0
7.44-x = 0
7.44-x = 0 // - 7.44
-x = -7.44 // * -1
x = 7.44
x = 7.44
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