(3x+3) - (2-6x)
When there is a - in front of an expression in parentheses, change the sign of each term of the expression and remove the parentheses.
3x+3-2+6x
Collect like terms/ which is 3x+6x=9x
9x+3-2
Subtract the numbers/ which is 3-2=1
9x+1
Solution = 9x+1