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5*1⁵+4*1⁴+3*1³+2*1²+a=5*(-1)⁵+4*(-1)⁴+3*(-1)³+2*(-1)²+a*(-1)
5+4+3+2+1+a=-5+4-3+2-a
14+a=-2-a
14+2=-2a
16=-2a/(-2)
a=-8