tolong beserta caranya ya, terimakasih

sudut c = (4x-10)+2x = 180
= 6x-10. = 180
= 6x. =180 + 10
= 6x. = 190
= x. = 190/6
= x = 31,6
sudut B = sudut A +sudut B + sudut C= 180
= 60 + ? +2(31,6) = 180
= 60 +63,2+ ?? = 180
= 123,2+??= 180
??= 180-123,2
sudut B ??=57,2derajat