Answer:
1.) -5x²=-21
2.)6+1=0
3.)6x+5=x²
4.)x²+49=-3x
5.)2x²+4(x²+9)
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Answer:
1.) -5x²=-21
2.)6+1=0
3.)6x+5=x²
4.)x²+49=-3x
5.)2x²+4(x²+9)