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x in (-oo:+oo)
(1/5)*x = -6*x-21 // + -6*x-21
(1/5)*x-(-6*x)+21 = 0
(1/5)*x+6*x+21 = 0
31/5*x+21 = 0 // - 21
31/5*x = -21 // : 31/5
x = -21/31/5
x = -105/31
x = -105/31
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