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x in (-oo:+oo)
x/5-(35/25) = 40/25 // - 40/25
x/5-(35/25)-(40/25) = 0
x/5-7/5-8/5 = 0
1/5*x-3 = 0 // + 3
1/5*x = 3 // : 1/5
x = 3/1/5
x = 15
x = 15
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