Question

81 – (2.x + 1)  = 12                  

Answer 1

(2x-1)=69

2x=70

x=35

Answer 2

\(81-\left(2x+1\right)=12\\ \Rightarrow2x+1=69\\ \Rightarrow2x=68\\ \Rightarrow x=34\)

Answer 3

⇔2x+1=69

⇔2x=68

⇔x=34

Answer 4

\(2x+1=81-12\Rightarrow2x+1=69\Rightarrow2x=67\Rightarrow x=\dfrac{67}{2}\)

Answer 5

81-2x-1=12

80-2x=12

-2x=12-80

-2x=-68

-x=-34

x=34