To solve for x you need to isolate the variable, or get it alone.
−2 + 3x + x = 9 − x
Add like terms
4x − 2 = 9 − x
Isolate variable by adding 2 and an x to both sides.
5x = 11
x = 2.2
Check your answer in the original equation.
Multiply by a common denominator to remove fractions.
Use the same method as seen in part (a) to solve part (b).
x = 6
Use the same methods as parts (a) and (b) to solve parts (c) and (d).
x = −10.5