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x in (-oo:+oo)
(21/2)*x = -15.6 // + 15.6
(21/2)*x+15.6 = 0
21/2*x+15.6 = 0 // - 15.6
21/2*x = -15.6 // : 21/2
x = -15.6/21/2
x = -1.48571429
x = -1.48571429
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