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x in (-oo:+oo)
x/7+4/7 = x/5-(2/5) // - x/5-(2/5)
x/7-(x/5)+4/7+2/5 = 0
34/35-2/35*x = 0 // - 34/35
-2/35*x = -34/35 // : -2/35
x = -34/35/(-2/35)
x = 17
x = 17
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