a ) ( x - 18 ) + 26 = 17 + 9
( x - 18 ) + 26 = 26
x - 18 = 26 - 26
x - 18 = 0
x = 0 + 18
x = 18
b ) 8 - ( 2 × x - 6 ) = 36 : 9
8 - ( 2 × x - 6 ) = 4
2 × x - 6 = 8 - 4
2 × x - 6 = 4
2 × x = 4 + 6
2 × x = 10
x = 10 : 2
x = 5
c ) ( 20 - x × 3 ) + 56 = 68
20 - x × 3 = 68 - 56
20 - x × 3 = 12
x × 3 = 20 - 12
x × 3 = 8
x = 8 : 3
x = `8/3`
d ) 35 : ( 2 × x + 7 ) = 5
2 × x + 7 = 35 : 5
2 × x + 7 = 7
2 × x = 7 - 7
2 × x = 0
x = 0 : 2
x = 0
e ) ( x + 1 ) + ( x + 2 ) + .... + ( x + 100 ) = 5150
( x × 100 ) + ( 1 + 2 + ... + 100 ) = 5150
( x × 100 ) + 5050 = 5150
x × 100 = 5150 - 5050
x × 100 = 100
x = 100 : 100
x = 1
`#dtkc`
