(1)x+2.7=12.5,
x+2.7-2.7=12.5-2.7,
x=9.8,
把x=9.8代入原方程,方程左边=9.8+2.7=12.5,右边=12.5,左边=右边,故x=9.8是原方程的解;
(2)x-10.75=3.84,
x-10.75+10.75=3.84+10.75,
x=14.59,
把x=14.59原方程,方程的左边=14.59-10.75=3.84,右边=3.84,左边=右边,故x=14.59是原方程的解;
(3)x÷4.2=1.5,
x÷4.2×4.2=1.5×4.2,
x=6.3;
(4)29x+4.3=7.2,
29x+4.3-4.3=7.2-4.3,
29x=2.9,
29x÷29=2.9÷29,
x=0.1;
(5)3x+3.5×2=59.2,
3x+7-7=59.2-7,
3x÷3=52.2÷3,
x=17.4;
(6)10x-7.5x=0.125×8,
2.5x=1,
2.5x÷2.5=1÷2.5,
x=0.4.