a) 50 : (x - 7) + 12 = 17
50 : (x - 7) = 17 - 12
50 : (x - 7) = 5
(x - 7) = 50 : 5
(x - 7) = 10
x = 10 + 7
\(\Rightarrow\) x = 17
b) 96 - 3 (x + 1) =42
3 (x + 1) = 96 - 42
3 (x + 1) = 54
(x + 1) = 54 : 3
(x + 1) = 18
x = 18 - 1
\(\Rightarrow\) x = 17
c) 63 : (x - 31) + 100 = 107
63 : (x - 31) = 107 - 100
63 : (x - 31) = 7
x - 31 = 63 : 7
x - 31 = 9
x = 9 + 31
\(\Rightarrow\) x = 40
CHÚC BẠN HOK TỐT
a. 50 : ( x + 7 ) + 12 = 17
50 : ( x + 7 ) = 5
( x + 7 ) = 50 : 5
x + 7 = 10
x = 3
b. 96 - 3( x + 1 ) = 42
3(x + 1 ) = 54
x + 1 = 18
x = 17
c. 63 : (x - 31) + 100 = 107
63 : (x - 31) = 7
x - 31 = 63 : 7
x - 31 = 9
x = 40
võ thị khánh ly ơi! (x-7) chứ ko phải (x+7) đâu bn nha!
\(50:\left(x-7\right)+12=17\) \(96-3\left(x+1\right)=42\)
\(50:\left(x-7\right)=5\) \(3\left(x+1\right)=54\)
\(x-7=10\) \(x+1=18\)
\(x=3\) \(x=17\)
\(63:\left(x-31\right)+100=107\)
\(63:\left(x-31\right)=7\)
\(x-31=9\)
\(x=40\)
