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y in (-oo:+oo)
13 = y/31.25+8 // - y/31.25+8
13-(y/31.25)-8 = 0
13-0.032*y-8 = 0
5-0.032*y = 0 // - 5
-0.032*y = -5 // : -0.032
y = -5/(-0.032)
y = 156.25
y = 156.25
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