a , ( X - 140): 7 = 33 - 23 x 3
( X - 140): 7 = 27 - 8 x 3
( X - 140): 7 = 27 - 24
( X - 140): 7 = 3
( X - 140) = 3 x 7
( X - 140) = 21
X =140 +21
X = 161
a) ( X -140 ) :7 = 33 - 23 x 3
(X - 140 ) : 7 = 57
( X -140 ) = 57 x 7 = 399
x = 399 + 140
x = 539
b) X - 6 : 3 - ( 48 - 28 ) : 2 : 6 -3 = 0
X - 6 : 3 - ( 48 - 28 ) : 2 : 6 = 3
X - 6 : 3 - ( 48 - 28 ) : 2 = 3 . 6 = 18
X - 6 : 3 - ( 48 - 28 ) = 18 . 2 =36
X - 6 - ( 48 - 28 ) = 36 . 3 = 108
X - ( 48 - 28 ) = 108 + 6 = 114
X - 20 = 114
X = 114 + 20 = 134
c) 27 . 2X = 243
2X = 243 : 27 = 9
X = 9 : 2 = 4,5
d) ( X - 5 ) 3 = 8
( X - 5 ) 3 = 2 3
X = 23 - 13 = 7
b , X - 6 : 3 - ( 48 - 28 ) : 2 : 6 - 3 = 0
X - 6 : 3 - 20 : 2 : 6 - 3 = 0
X - 6 : 3 - 20 : 2 : 6= 0 + 3
X - 6 : 3 - 20 : 2 : 6 = 3
X - 6 : 3 - 20 : 2 = 3 x 6
X - 6 : 3 - 20 : 2 = 18
X - 6 : 3 - 20 = 18 x 2
X - 6 : 3 - 20 = 36
X - 6 : 3 = 36 + 20
X - 6 : 3 = 56
X - 6 = 56 x 3
X - 6 = 168
X = 168 - 6
X = 162