70 = -5(-2 + x) two step equations i’ve done pretty good so far and this is my last question, soon

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18