2(x+7)-7(3x-2)=9(2-x) Original problem
(2x+14)-(21x-14)=(18-9x) Distribute and stuff
2x+14-21x+14=18-9x Open it up
-19x+28=18-9x Clean it up a bit
10=10x Start doing math
x=1 We got x=1, now put it in the original problem
2((1)+7)-7(3(1)-2)=9(2-(1)) Plug in the 1
2(8)-7(1)=9(1) Do some math
16-7=9 Some more math
9=9 9=9
