Question

  

Answer 1

      \(\dfrac{3-4x}{7}=\dfrac{-2}{9}\)
\(\Leftrightarrow\left(3-4x\right)\cdot9=\left(-2\right)\cdot7\)
\(\Leftrightarrow27-36x=-14\)
\(\Leftrightarrow36x=27-\left(-14\right)=41\)
\(\Leftrightarrow x=41:36=\dfrac{41}{36}\)
Vậy \(x=\dfrac{41}{36}\)

\(\#PeaGea\)

Answer 2

\(\dfrac{3-4x}{7}=\dfrac{-2}{9}\)

=>\(\dfrac{4x-3}{7}=\dfrac{2}{9}\)

=>\(4x-3=2\cdot\dfrac{7}{9}=\dfrac{14}{9}\)

=>\(4x=\dfrac{14}{9}+3=\dfrac{14}{9}+\dfrac{27}{9}=\dfrac{41}{9}\)

=>\(x=\dfrac{41}{9}:4=\dfrac{41}{36}\)

Answer 3

Câu 1

a) (3 - 4x)/7 = -2/9

9(3 - 4x) = -2.7

27 - 36x = -14

36x = 27 + 14

36x = 41

x = 41/36