Question

\(\frac{12+x}{^{43+x}}\)= \(\frac{2}{3}\)

Answer 1

\(\frac{12+50}{43+129}=\frac{2}{3}\)

Answer 2

\(\Rightarrow3\left(12+x\right)=2\left(43+x\right)\)

\(\Leftrightarrow36+3x=86+2x\)

\(\Leftrightarrow x=86-36=50\)

Answer 3

bạn ơi 2 x phải bằng nhau nhé 

Answer 4

\(\frac{12+x}{43+x}=\frac{2}{3}\)

\(\Leftrightarrow\left(12+x\right).3=\left(43+x\right).2\)

\(\Leftrightarrow3.12+3x=2.43+2x\)

\(\Leftrightarrow36+3x=86+2x\)

\(\Leftrightarrow3x-2x=86-36\)

\(\Leftrightarrow1x=50\Leftrightarrow x=50\)

Answer 5

\(\frac{12+x}{43+x}=\frac{2}{3}\)

\(\Rightarrow\left(12+x\right)\times3=\left(43+x\right)\times2\)

\(\Leftrightarrow36+3x=86+2x\)

\(\Leftrightarrow3x-2x=50\)

\(\Leftrightarrow x\left(3-2\right)=50\)

\(\Leftrightarrow x1=50\Leftrightarrow x=50\)