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x in (-oo:+oo)
x/6 = x/7+8/6 // - x/7+8/6
x/6-(x/7)-(8/6) = 0
x/6-(x/7)-4/3 = 0
1/42*x-4/3 = 0 // + 4/3
1/42*x = 4/3 // : 1/42
x = 4/3/1/42
x = 56
x = 56
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