Question

Tim x, biet:

a.(3-x)+(2x+7)=2x

b. \(\dfrac{x+1}{2}=\dfrac{1}{3}\)

GIUP MK VS

Answer 1

a) 3-x+2x+7=2x

=> 3+x+7=2x

=> 10+x=2x

=> x-2x=-10

=> -x=-10

=> x=10

Vậy x= 10

b) 3(x+1)=2

=> x+1=2/3

=>x=2/3-1

=> x= 2/3 - 3/3

=> x= -1/3

Vậy x = -1/3

Answer 2

Lời giải:

a, \(\left(3-x\right)+\left(2x+7\right)=2x\)

\(\Rightarrow3+x+7=2x\)

\(\Rightarrow x+10=2x\)

\(\Rightarrow x-2x=-10\)

\(\Rightarrow-x=-10\)

\(\Rightarrow x=10\)

b, \(\dfrac{x+1}{2}=\dfrac{1}{3}\)

\(\Rightarrow3.\left(x+1\right)=2.1\)

\(\Rightarrow3\left(x+1\right)=2\)

\(\Rightarrow x+1=\dfrac{2}{3}\)

\(x=\dfrac{-1}{3}\)