1) 19.5 - 0.3x = 15.9
Subtract 19.5 from both sides:
-0.3x = -3.6
Divide by -0.3:
x = 12
2) (7 - 0.2x) * 1.4 = 7.56
Divide by 1.4:
7 - 0.2x = 5.4
Subtract 7 from both sides:
-0.2x = -1.6
Divide by -0.2:
x = 8
3) (6.1x - 13.2) ÷ 1.7 = 3
Multiply by 1.7:
6.1x - 13.2 = 3 * 1.7
6.1x - 13.2 = 5.1
Add 13.2 to both sides:
6.1x = 18.3
Divide by 6.1:
x = 3
1) 19.5 - 0.3x = 15.9
Subtract 19.5 from both sides:
-0.3x = -3.6
Divide by -0.3:
x = 12
2) (7 - 0.2x) * 1.4 = 7.56
Divide by 1.4:
7 - 0.2x = 5.4
Subtract 7 from both sides:
-0.2x = -1.6
Divide by -0.2:
x = 8
3) (6.1x - 13.2) ÷ 1.7 = 3
Multiply by 1.7:
6.1x - 13.2 = 3 * 1.7
6.1x - 13.2 = 5.1
Add 13.2 to both sides:
6.1x = 18.3
Divide by 6.1:
x = 3