SOLUTION: can you show how to do {{{matrix(1,3,x+2+5(x-1),"=",7x+3)}}}

Remove the parentheses by multiplying the 

by both terms inside the parentheses 







Combine the x and the 5x as 6x

Combine the +2 and the -5 as -3.









Add -7x to both sides







Combine the 6x and the -7x as -x

Combine the 7x and the -7x as 0, so you don't bother

writing 0, you just erase the 7x and the -7x







Add 3 to both sides:







The -3 and the +3 cancel on the left.

Combine 3+3 as 6







Write the coefficient of x as -1:







Divide both sides by the coefficient -1:









Cancel the -1's on the left and do the 

division on the right:







Edwin