Question

how to solve this explain​

Answer 1

Step-by-step explanation:

x+21=20

x=20-21

x=-1

Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

Answer 2

Answer:

The answer is

Step-by-step explanation:

Given:

x+21=20

So, we can shift 21 from the left to the right and change the sigh

=

x=20-21

so, 20-21 = -1

Therefore, x= -1