Answer:
Yes, 2 is a rational number.
There are 10,000 possible values the digits 0 and 9 can be arranged as a 4-digit number.
-2x +7 = 3x - 8
Move the variable to the left-hand side and change its sign
-2x -3x+ 7 = -8
Move the constant to the right-hand side and change its sign
-2x -3x = -8 -7
Collect like terms
-5x = -15
Divide both sides of the equation by -5
x=3