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x in (-oo:+oo)
(-100/1)*x+60 = 25 // - 25
(-100/1)*x-25+60 = 0
60-100*x-25 = 0
35-100*x = 0 // - 35
-100*x = -35 // : -100
x = -35/(-100)
x = 7/20
x = 7/20
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