(1)8x+42=178
8x+42-42=178-42
8x=136
8x÷8=136÷8
x=17;
(2)x-60%x=160
0.4x=160
0.4x÷0.4=160÷0.4
x=400;
(3)x+
x=2401 5
x=2406 5
x×6 5
=240×5 6
5 6
x=200;
(4)60%x-35%x=125
0.25x=125
0.25x÷0.25=125÷0.25
x=500.