B would have to equal 9 and a should equal -2 to get 0
I would say read it well and then write down an equation or expression to represent the data so its easier for you to understand and/or solve.
1 - 3x = x + 3 |subtract 1 from both sides
-3x = x + 2 |subtract x from both sides
-4x = 2 |divide both sides by (-4)
x = 2/-4
x = -0.5