Twice the sum of a number and 7 is equal to three times the difference of the number and 8. Find the number.

How many real and imaginary solutions does the equation x^2-3x=-2x-7 have?

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

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9