Final answer:
The best estimate for x in the equation -2x + 902 = 1,518 is -308.
Step-by-step explanation:
To find the value of x in the equation -2x + 902 = 1,518, we need to isolate x.
Step 1: Subtract 902 from both sides of the equation:
-2x = 1,518 - 902
-2x = 616
Step 2: Divide both sides by -2 to solve for x:
x = 616 / -2
x = -308
Therefore, the best estimate for x is -308.