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7x +3x +5x = 180 derajat
15x =180
x = 180/15
x =12
maka keseluruha sudutnya adalah
7x= 12× 7
= 84 derajat
3x= 12×3
= 36
5x= 12×5
=60
maaf kalau salah...
A = 180 - 7x
B + 5x = 180 (sudut berpelurus)
B = 180 - 5x
A + B + 3x = 180 (jumlah sudut segitiga)
(180 - 7x) + (180 - 5x) + 3x = 180
180 - 7x + 180 - 5x + 3x = 180
360 - 9x = 180
- 360 - 360 +
-9x = -180
-9x : -9 = -180 : -9
x = 20
Jadi, nilai x adalah 20