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x in (-oo:+oo)
(1/5)*(x+2) = -10 // + 10
(1/5)*(x+2)+10 = 0
1/5*(x+2)+10 = 0
1/5*(x+2)+10 = 0
1/5*x+52/5 = 0
1/5*x+52/5 = 0
1/5*x+52/5 = 0 // - 52/5
1/5*x = -52/5 // : 1/5
x = -52/5/1/5
x = -52
x = -52
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