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x in (-oo:+oo)
x/10-2.5 = 7.5 // - 7.5
x/10-7.5-2.5 = 0
1/10*x-10 = 0 // + 10
1/10*x = 10 // : 1/10
x = 10/1/10
x = 100
x = 100
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