The second property of the equation: the two sides of the equation are multiplied by the same formula at the same time, and the sub-equation still holds.
Both sides of the equation add and subtract the same number at the same time, and the result of the equation remains the same.
Both sides of the equation are multiplied or divided by the same number at the same time, and the result of the equation remains the same.
Extended attribute
Extension 1: subtract a number or formula from both sides of the equation at the same time, and the result is still equal.
If a = b, then c-a = c-b.
Extension 2: Take the opposite numbers on both sides of the equation, and the result is still equal.
If -a =-b, then-a =-b.
Extension 3: When both sides of the equation are not equal to 0, if we divide by the same number or formula, the results are still equal.
If a = b ≠ 0, then c/a = c/b.
Extension 4: When the two sides of the equation are not equal to 0, the results are still equal when the two sides are reciprocal.
If a = b ≠ 0, then1/a =1/b.