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2x+18+2x-10=180
4x-8=180
4x=172
X = 43
Sudut b= 2x-10 derajat = 2.43-10 derajat = 86-10 derajat = 76 derajat
2x-2x = -18-10
x = -28
sudut b=2.-2-10
= -24