4x+5x=9x — step-by-step solution

Let's solve in

ℝ

4 x + 5 x = 9 x

ⓘ Like terms are grouped by adding their coefficients:

4 x + 5 x

9 x

9 x = 9 x

9 x - 9 x = 0

ⓘ Like terms are grouped by adding their coefficients:

9 x - 9 x

0

0 = 0

▶Solution found:

x \in ℝ