Answer:
x=(c/a+b)
Step-by-step explanation:
..........
x =
Given
ax + bx = c ← factor out x from each term on the left side
x(a + b) = c ← divide both sides by (a + b)
Sara is now 4, will be 8 in 4 years. Ralph is now 12, will be 16 in 4 years.