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x in (-oo:+oo)
x/10 = 9/2.5 // - 9/2.5
x/10-(9/2.5) = 0
x/10-3.6 = 0
1/10*x-3.6 = 0 // + 3.6
1/10*x = 3.6 // : 1/10
x = 3.6/1/10
x = 36
x = 36
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