6(-3+7(-2+5)) how to solve
When the problem has parentheses, begin with the calculations
inside the parentheses. When there are parentheses inside parentheses,
start inside the inner-most parentheses, and work out from there.
6 (-3 + 7 (-2 + 5))
6 (-3 + 7(3))
6 (-3 + 7 (3))
6 (-3 + 21)
6 (-3 + 21)
6 (18)
6 (18)
108