827
7x-49=14x-196
14x-7x=-49+196
7x=147
x=147:7
x=21
828
11x-121=5x-25
11x-5x=121-25
6x=96
x=96:6
x=16
829
8x-64=4x-16
8x-4x=64-16
4x=48
x=48:4
x=12
830
7x-49=15x-225
15x-7x=-49+225
8x=176
x=176:8
x=22
831
x-3+x+7=0
2x=-4
x=-2
832
x-1+x+6=0
2x=-5
x=-2,5