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x in (-oo:+oo)
x/2+5 = x/7+50/7 // - x/7+50/7
x/2-(x/7)-(50/7)+5 = 0
x/2-(x/7)-50/7+5 = 0
5/14*x-15/7 = 0 // + 15/7
5/14*x = 15/7 // : 5/14
x = 15/7/5/14
x = 6
x = 6
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