October 2020 0 68 Report
Dada a expressão: 3 - 7(1 - 2x) = 5 - (x - 9) Porquê    3 - 7(1 - 2x)    ficará assim:

3-7 + 14x    ?

1-2x ficaria igual a 2x?
E de qualquer modo, o 7 já multiplicou o 2x, porque fica um sinal de + ?
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