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1)87:(4х+5)=3
4х+5=87:3
4х+5=29
4х=29-5
4х=24
х=24:4
х=6
2)17*(3х-16)=85
3х-16=85:17
3х-16=5
3х=5+16
3х=21
х=21:3
х=7

9*(6х-13)=153
6х-13=153:9
6х-13=17
6х=17+13
6х=30
х=30:6
х=5

87 : ( 4x + 5 ) = 3

4x + 5 = 87 : 3

4x + 5 = 29

4x = 29 - 5

4x = 24

x = 24 : 4

x = 6

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17 * ( 3x - 16 ) = 85

3x - 16 = 85 : 17

3x - 16 = 5

3x = 5 + 16

3x = 21

x = 21 : 3

x = 7

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9 * ( 6x - 13 ) = 153

6x - 13 = 153 : 9

6x - 13 = 17

6x = 17 + 13

6x = 30

x = 30 : 6

x = 5