4x+5x=9x+7 — step-by-step solution

Let's solve in

ℝ

4 x + 5 x = 9 x + 7

ⓘ Like terms are grouped by adding their coefficients:

4 x + 5 x

9 x

9 x = 9 x + 7

ⓘ We subtract

9 x

from both sides

9 x - 9 x = 7

ⓘ Like terms are grouped by adding their coefficients:

9 x - 9 x

0

0 = 7

The statement

-7 = 0

is false, whatever the value of

x

▶Solution:

x \in \emptyset