which equation can be used to represent 'three minus the difference of a number and one equals one-half of the difference of three times the same number and four

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

Negative 5 1/12 + negative 4 1/4 + 6 3/4

Solve 3x-18=2y and 5x-6y=6 by elimination show work