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The sum of all the internal angles of a triangle = 180*

(2x+10)+10x-20)+(3x+2)=180
15x-3=180
15x=183
x=183/15=12.2
x=12.2
(15x-3)=15(12.2)-3=180

Is it right

I guess you did a mistake?
2x+15

Please can you check it

it's 2x+15!

I got 15x -3 = 180

I wrote wrong here.
but I put the correct numbers

yes I got the same

2x + 15 + 10x – 20 + 3x + 2 = 180

x = 12.2 is right!

My textbook saying 90 as a answer