Răspuns:
Explicație pas cu pas:
( 3 x a + 5 ) x 5 - 3 = 292
( 3 x a + 5 ) x 5 = 292 + 3
( 3 x a + 5 ) x 5 = 295
3 x a +5 = 295 : 5
3 x a + 5 =59
3 x a = 59- 5
3 x a = 54
a = 54 : 3
a = 18
( b - 5 ) x 2 = 30
b - 5 =30 : 2
b - 5 = 15
b =15 + 5
b = 20
( c - 17) x 3 + 15 = 45
( c - 17) x 3 =45-15
( c - 17 ) x 3 =30
c - 17 = 30 : 3
c - 17 = 10
c = 10+17
c= 27
[2 x ( d - 30) - 45 ] x 3 = 165
[ 2 x ( d- 30 ) -45 ] = 165: 3
[ 2 x ( d - 30 ) - 45 ] = 55
2 x ( d - 30 ) =55 + 45
2 x ( d -30 ) = 100
( d -30 ) = 100: 2
d-30 =50
d = 50 + 30
d= 80