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b.
3x + 5 + x - 3 = 90
3x + x + 5 - 3 = 90
4x + 2 = 90
4x = 90 - 2
4x = 88
x = 88/4
x = 22
c.
sudut (1) =
3x + 5
=3(22) + 5
=66 + 5
=71derajat
sudut(2) =
x - 3
=22 - 3
=19derajat
semoga membantu!!
b. penyelesaian
3x+5+x-3=90
4x+2 = 90
4x = 88
x = 22°
c. sudut pertama (3x+5)=3*22+5=71°
sudut kedua (x-3)=22-3=19°