Question

me ajudennnmnn por favorr​

Answer 1

Questão 6)

a)

$3*(x+3)=22\\ \\ 3x+9=22\\ \\ 3x=22-9\\ \\ 3x=13\\ \\ x=\dfrac{13}{3}$

b)

$4*(x+3)=2*(x-3)\\ \\ 4x+12=2x-6\\ \\ 4x-2x=-6-12\\ \\ 2x=-18\\ \\ x=\dfrac{-18}{2} \\ \\ x=-9$

Questão 7)

a)

$\dfrac{x}{2} -\dfrac{x}{4} =\dfrac{1}{2} \\\\\\ \\ \dfrac{2x-x}{4} =\dfrac{1}{2} \\ \\\\\\ \dfrac{x}{4} =\dfrac{1}{2} \\ \\ \\ 2x=4\\ \\ \\ x=\dfrac{4}{2} \\ \\ \\ x=2$

b)

$\dfrac{x}{5} +\dfrac{x}{2} =\dfrac{7}{10} \\ \\ \\\\ \dfrac{2x+5x}{10} =\dfrac{7}{10} \\ \\ \\ \\ \dfrac{7x}{10} =\dfrac{7}{10} \\ \\ \\ \\ x=\frac{\dfrac{7}{10}}{\dfrac{7}{10}} \\ \\ \\ \\ x=\dfrac{7}{10}~*~\dfrac{10}{7} \\ \\ \\ \\ x=\dfrac{70}{70} \\ \\ \\ \\ x=1$

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