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x in (-oo:+oo)
2*x+1 = -2*x-31 // + -2*x-31
2*x-(-2*x)+1+31 = 0
2*x+2*x+1+31 = 0
4*x+32 = 0 // - 32
4*x = -32 // : 4
x = -32/4
x = -8
x = -8
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