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x in (-oo:+oo)
x/12 = (3*x)/8-7 // - (3*x)/8-7
x/12-((3*x)/8)+7 = 0
x/12+(-3/8)*x+7 = 0
7-7/24*x = 0 // - 7
-7/24*x = -7 // : -7/24
x = -7/(-7/24)
x = 24
x = 24
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