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x in (-oo:+oo)
(1/5)*x = 7.5 // - 7.5
(1/5)*x-7.5 = 0
1/5*x-7.5 = 0 // + 7.5
1/5*x = 7.5 // : 1/5
x = 7.5/1/5
x = 37.5
x = 37.5
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