Question 104709
{{{3(x-7)}}} Start with the given expression



{{{3*x-3*7}}} Distribute 3 to each term in the parenthesis. In other words, multiply 3 by x and by -7



{{{3x-21}}} Multiply -3 and 7 to get -21



So {{{3(x-7)=3x-21}}} 


note: in the previous problem {{{3(x-6)=3x-18}}} notice that 3 is multiplied by x and -6 to get 3x and -18