(1)3x-4×6.5=7.6
3x-26=7.6
3x-26+26=7.6+26
3x=33.6
3x÷3=33.6÷3
x=11.2;
(2)x-0.25x=7.5
0.75x=7.5
0.75x÷0.75=7.5÷0.75
x=10;
(3)3(6.5-x)=9.6
3(6.5-x)÷3=9.6÷3
6.5-x=3.2
6.5-x+x=3.2+x
3.2+x=6.5
3.2+x-3.2=6.5-3.2
x=3.3;
(4)(2x-4.6)÷6=1.8
(2x-4.6)÷6×6=1.8×6
2x-4.6=10.8
2x-4.6+4.6=15.4
2x=15.4
2x÷2=15.4÷2
x=7.7.