Resposta :



(3/5x²y-2zh)+(1+2zh+2/5x²y)-(x²y+1)
3/5x²y - 2zh + 1 + 2zh + 2/5x²y - x²y - 1)

3/5x²y + 2/5x²y - x²y - 2zh + 2zh  - 1 +1

=  0 

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