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x in (-oo:+oo)
(3/8)*x+21 = 14 // - 14
(3/8)*x-14+21 = 0
3/8*x+7 = 0 // - 7
3/8*x = -7 // : 3/8
x = -7/3/8
x = -56/3
x = -56/3
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