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x in (-oo:+oo)
(1/5)*(x+1) = -3 // + 3
(1/5)*(x+1)+3 = 0
1/5*(x+1)+3 = 0
1/5*(x+1)+3 = 0
1/5*x+16/5 = 0
1/5*x+16/5 = 0
1/5*x+16/5 = 0 // - 16/5
1/5*x = -16/5 // : 1/5
x = -16/5/1/5
x = -16
x = -16
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