Question

2(1-x)+3x-7=0

Answer 1

2-x+3x-7=0

<=>2x-5=0

<=>2x=5

<=>x=\(\dfrac{5}{2}\)

Answer 2

\(2\left(1-x\right)+3x-7=0\\ 2-2x+3x-7=0\\ \leftrightarrow x-5=0\\ \leftrightarrow x=5\)

Vậy phương trình có nghiệm duy nhất \(x=5\)

Answer 3

\(2\left(1-x\right)+3x-7=0\)

\(\Leftrightarrow2-2x+3x-7=0\)

\(\Leftrightarrow x-5=0\Leftrightarrow x=5\)