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