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x in (-oo:+oo)
5*x+3 = -5*x-17 // + -5*x-17
5*x-(-5*x)+3+17 = 0
5*x+5*x+3+17 = 0
10*x+20 = 0 // - 20
10*x = -20 // : 10
x = -20/10
x = -2
x = -2
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