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x in (-oo:+oo)
7-((3*x)/8) = 12 // - 12
7-((3*x)/8)-12 = 0
(-3/8)*x-12+7 = 0
-3/8*x-5 = 0 // + 5
-3/8*x = 5 // : -3/8
x = 5/(-3/8)
x = -40/3
x = -40/3
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