a) ( 4 x - 32 ) : 4 = 17
4 x - 32 = 17 × 4
4 x - 32 = 68
4 x = 68 + 32
4 x = 100
x = 100 : 4
x = 25
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b) 92 + 56 : ( 14 - y ) = 100
56 : ( 14 - y ) = 100 - 92
56 : ( 14 - y ) = 8
14 - y = 56 : 8
14 - y = 7
y = 14 - 7
y = 7
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c) ( z : 9 ) × 15 - 47 = 28
( z : 9 ) × 15 = 28 + 47
z : 9 = 75 : 15
z : 9 = 5
z = 5 × 9
z = 45
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d) ( 410 - t ) : 7 + 70 = 120
( 410 - t ) : 7 = 120 - 70
410 - t = 50 × 7
410 - t = 350
t = 410 - 350
t = 60
