1) (1.8+x) * 21=71.4 2) 16 (4x_3.4) = 6.08 3) (x-1.25) * 4.5=27 4) (x+19.64) * 0.18=144 5) 17 (1.6-5x) = 2.38 6) 9.66: (x+0.17) = 23 7) 5.6: (x-6) = 8 8) 5.6:x-6=8 9) 34.12-x:3.08=34.03 10) x:100-1.2367=2.9633 11) 9.2 (0.01y+0.412) = 4.6 12) 8.8 (0.12y-0.04) = 0.44

1) 1.8 + x = 71.4 : 21;

1.8 + x = 3.4;

x = 3.4 - 1.8;

x = 1.6;

2) 4x - 3.4 = 6.08 : 16;

4x - 3.4 = 0.38;

4x = 0.38 + 3.4;

4x = 3.78;

x = 3.78 : 4;

x = 0.945;

3) x - 1.25 = 27 : 4.5;

x - 1.25 = 6;

x = 6 + 1.25;

x = 7.25;

4) x + 19.64 = 144 : 0.18;

x + 19.64 = 800;

x = 800 - 19.64;

x = 780.36;

5) 1.6 - 5x = 2.38 : 17;

1.6 - 5x = 0.14;

5x = 1.6 - 0.14;

5x = 1.46;

x = 1.46 : 5;

x = 0.292;

6) x + 0.17 = 9.66 : 23;

x + 0.17 = 0.42;

x = 0.42 - 0.17;

x = 0.25;

7) x - 6 = 5.6 : 8;

x - 6 = 0.7;

x = 0.7 + 6;

x = 6.7;

8) 5.6 : x = 8 + 6;

5.6 : x = 14;

x = 5.6 : 14;

x = 0.4;

9) x : 3.08 = 34.12 - 34.03;

x : 3.08 = 0.09;

x = 0.09 * 3.08;

x = 0.2772;

10) x : 100 = 2.9633 + 1.2367;

x : 100 = 4.2;

x = 4.2 * 100;

x = 420;

11) 0.01y + 0.412 = 4.6 : 9.2;

0.01y + 0.412 = 0.5;

0.01y = 0.5 - 0.412;

0.01y = 0.088;

y = 0.088 : 0.01;

y = 8.8;

12) 0.12y - 0.04 = 0.44 : 8.8;

0.12y - 0.04 = 0.05;

0.12y = 0.05 + 0.04;

0.12y = 0.09;

y = 0.09 : 0.12;

y = 0.75;