On the left side, we distribute the 5 through the parentheses to get $5*3 - 5*2x = 15 - 10x$. On the right side, we distribute the -2 through the parentheses to get $7 - 2*1 + 2*4x = 7 - 2 + 8x = 5 + 8x$.
So, the equation becomes $15 - 10x = 5 + 8x$.
Show more…