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x in (-oo:+oo)
4-((7/2)*x) = 25 // - 25
4-((7/2)*x)-25 = 0
(-7/2)*x-25+4 = 0
-7/2*x-21 = 0 // + 21
-7/2*x = 21 // : -7/2
x = 21/(-7/2)
x = -6
x = -6
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