(1) Because 5 is multiplied on both the sides of the equality, the multiplication property of equality is used.
(2) Because 5 is added on both the sides of the equality, the addition property of equality is used.
(3) Because 2 is divided on both the sides of the equality, the division property of equality is used.
(4) Because 7 is subtracted from both the sides of the equality, the subtraction property of equality is used.