a. 23 . ( 42 - x ) = 46
42 - x = 46 : 23
42 - x = 2
x = 42 - 2
x = 40
b. 7x - 8 = 41
7x = 41 + 8
7x = 49
x = 49 : 7
x = 7
c. 125 - 5(x + 3) = 15
5(x + 3) = 125 - 15
5(x + 3) = 110
x + 3 = 110 : 5
x + 3 = 22
x = 22 - 3
x = 19
a) 23 . ( 42 - x) = 46 => 42 - x = 46 : 23 = 2
=> x = 42 - 2 = 40
b) 7x - 8 = 41 => 7x = 41 + 8 = 49 => x = 49 : 7 = 7
c) 125 - 5.(x+3) = 15 => 5.(x+3) = 125 - 15 = 110 => x + 3 = 110 : 5 =22
=> x = 22 - 3 = 19
a . 23 . ( 42 - x ) = 46
966 - 23 . x = 46
23 . x = 920
x = 40
b. 7x - 8 = 41
7x = 49
x = 7
c. 125 - 5( x + 3 ) = 15
5( x + 3 ) = 110
x + 3 = 22
x = 19
a. 23 x ( 42 - X ) = 46
42 - X = 46 : 23
42 - X = 2
X = 42 - 2
X = 40
b. 7X - 8 = 41
7X = 41 + 8
7X = 49
X = 49 : 7
X = 7
c. 125 - 5 x ( X + 3 ) = 15
5 x X + 3 = 125 - 15
5 x X + 3 = 110
X + 3 = 110 : 5
X + 3 = 22
X = 22 - 3
X = 19
a, 23 . ( 42 - x ) = 46
42 - x = 46 : 23
42 - x = 2
x = 42 - 2
x = 40
b, 7x - 8 = 41
7x = 41 + 8
7x = 49
x = 49 : 7
x = 7
c, 125 - 5 . ( x + 3 ) = 15
5 . ( x + 3 ) = 125 - 15
5 . ( x + 3 ) = 110
x + 3 = 110 : 5
x + 3 = 22
x = 22 - 3
x = 19