7x+4y+3z+2t+2w= 9
2x+3y+6z+2t+7w= 18
4x+7y+5z+6t+3w= 15
7x+4y+3z+2t+5w= 9
7x+2y+7z+8t+4w= 21
Tem 1 minuto pra achar o valor de z
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