Answer
x = 0.0158
Work Step by Step
200x -0.67 =100x +0.81
200x -0.67 +0.67 =100x +0.81+0.67
200x=100x +1.58
200x -100x=100x +1.58 -100x
100x=1.58
$\frac{100x}{100}$=$\frac{1.58}{100}$
x=0.0158
Check
Replace x with 0.0158
200x -0.67 =100x +0.81
200$\times$0.018-0.67 =100$\times$0.0158 +0.81
3.60-0.67 = 1.58 + 0.81
2.93=2.93