1. 3/5 *x +12=x ; 12=x-3/5x; 12=2/5x; x=(12×5)/2; x=60/2; x=30.
2. 1/6*x+15=x ; 15=x-1/6x; 15=5/6x; x=(15×6)/5; x=90/5; x=18.
3. 1/11*x+30=x; 30=x-1/11x; 30=10/11x; x=(30×11)/10; x=330/10; x=33.
4. 3/7*x+2/5*x+720=x ;
5. 1/5*x+1/5*x+1800=x
6. 7/8*x=1673
7. 3/5*x+2/15+456=x