1)87÷(4x+5)=3; 2)17×(3x-16)=85;3)9×(6x-13)=153

87 : (4x + 5) = 3;

4х + 5 = 87 : 3;

4х + 5 = 29;

4х = 29 - 5;

4х = 24;

х = 24 : 4;

х = 6;

87 : (4 * 6 + 5) = 3;

87 : 29 = 3;

3 = 3;

17 * (3x - 16) = 85;

3х - 16 = 85 : 17;

3х - 16 = 5;

3х = 5 + 16;

3х = 21;

х = 21 : 3;

х = 7;

17 * (3 * 7 - 16) = 85;

17 * 5 = 85;

85 = 85;

9 * (6x - 13) = 153;

6х - 13 = 153 : 9;

6х - 13 = 17;

6х = 17 + 13;

6х = 30;

х = 30 : 6;

х = 5;

9 * (6 * 5 - 13) = 153;

9 * 17 = 153;

153 = 153.