Question

tìm x

a/2x-45=(-4x)+15

b/34-x=9+7x

Answer 1

a) \(2x-45=\left(-4x\right)+15\)

\(2x+4x=15+45\)

\(6x=60\)

\(x=10\)

vay \(x=10\)

b) \(34-x=9+7x\)

\(-x-7x=9-34\)

\(-8x=-25\)

\(x=\frac{25}{8}\)

vay \(x=\frac{25}{8}\)

Answer 2

 a ) 2x + 4x = 15 + 45

    6x = 60 

     x = 10

b ) - x - 7x = 34 + 9 

     -8x = 43

      x =\(\frac{43}{-8}\)

Answer 3

a) \(2x-45=\left(-4x\right)+15\)

\(\Rightarrow2x+4x=45+15\)

\(\Rightarrow6x=60\)

\(\Rightarrow x=10\)

b)\(34-x=9+7x\)

\(\Rightarrow-x-7x=9-34\)

\(\Rightarrow-8x=-25\)

\(\Rightarrow x=\frac{25}{8}=3,125\)