• Matéria: Matemática
  • Autor: sarinha123466
  • Perguntado 7 anos atrás

urgenteeeee pooooor favooooooor​

Anexos:

Respostas

respondido por: gryffindor05
0

(a)

\dfrac{1}{7}=\dfrac{x-6}{49}\Rightarrow7(x-6)=49\Rightarrow7x-42=49\Rightarrow7x=49+42\\ \Rightarrow7x=91\Rightarrow x=13

(b)

\dfrac{5x+3}{10}=\dfrac{-21}{30}\Rightarrow30(5x+3)=-210\Rightarrow150x+90=-210\Rightarrow150x=-210-90\\\Rightarrow150x=-300\Rightarrow x=-2

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