It is the commutative property of addition.
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They are terms of an expression which can be simplified to 4x+12 or factored to 4*(x+3)
4*(x + 3) = 4*x + 4*3 = 4x + 12
4 plus 8 is equal to 12. In arithmetic, addition is a basic operation that combines two numbers to give a total sum. In this case, adding 4 and 8 together results in 12.
7x + 16 = 3x + 4 4x = -12 x = -3
one and a quarter 5/6 = 10/12 10/12 + 5/12 = 15/12 = 5/4 5/4 = 4/4 + 1/4 = 1 + 1/4