Question

giúp ạ

Answer 1

\(\dfrac{15-x}{7}=\dfrac{x+7}{4}\)

\(\Leftrightarrow4\left(15-x\right)=7\left(x+7\right)\)

\(\Leftrightarrow60-4x=7x+49\)

\(\Rightarrow7x+4x=60-49\)

\(\Rightarrow11x=11\)

\(\Rightarrow x=\dfrac{11}{11}\)

\(\Rightarrow x=1\)

Answer 2

x = 1

Answer 3

dễ = 1 . pải hông?

Answer 4

\(\dfrac{15-x}{7}=\dfrac{x+7}{4}\\ \Rightarrow\left(15-x\right)\cdot4=\left(x+7\right)\cdot7\\ \Rightarrow60-4x=7x+49\\ \Rightarrow-4x-7x=49-60\\ \Rightarrow-11x=-11\\ \Rightarrow x=1\)

Answer 5

X=1 minh oi