Answer:
-3/2
Explanation:
3(7+2x)+3=3(5+X)-9(X+1)
 open the bracket
21+6x+3=15+3x-9x-9
 collect like terms
21+3+9-15=-6x+3x-9x
 re-arrange
6x-3x+9x=+15-9-21
12x=-18
X=-18/12
break down Into smallest units
X=-18/12=-9/6=-6/2
X=-3/2
hope the working is right and the answer too!