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x in (-oo:+oo)
x/4+(5*x)/7 = 54 // - 54
x/4+(5*x)/7-54 = 0
27/28*x-54 = 0 // + 54
27/28*x = 54 // : 27/28
x = 54/27/28
x = 56
x = 56
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