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x in (-oo:+oo)
x/7 = 4*x-108 // - 4*x-108
x/7-(4*x)+108 = 0
x/7-4*x+108 = 0
108-27/7*x = 0 // - 108
-27/7*x = -108 // : -27/7
x = -108/(-27/7)
x = 28
x = 28
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