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x in (-oo:+oo)
x/2.5 = 15/5 // - 15/5
x/2.5-(15/5) = 0
x/2.5-3 = 0
0.4*x-3 = 0 // + 3
0.4*x = 3 // : 0.4
x = 3/0.4
x = 7.5
x = 7.5
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