x : 2 = 53 + 17
x : 2 = 70
x = 70 x 2
x = 140
x : 2 - 17 = 53
(x : 2) = 53 + 17
x : 2 = 70
x = 70 x 2
x = 140
\(\Leftrightarrow x:2=70\Leftrightarrow x=140\)
\(x:2-17=53\)
\(\Leftrightarrow x=\left(53+17\right).2=140\)
X : 2 - 17 = 53
X : 2 = 53 + 17
X : 2 = 70
x = 70 x 2
x = 140
\(x:2-17=53\\ x:2=53+17\\ x:2=70\\ x=70.2\\ x=140\)