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x in (-oo:+oo)
x/25 = 7/10 // - 7/10
x/25-(7/10) = 0
x/25-7/10 = 0
1/25*x-7/10 = 0 // + 7/10
1/25*x = 7/10 // : 1/25
x = 7/10/1/25
x = 35/2
x = 35/2
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