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4(x + 1/4) + 3(x - 1) + 2(x + 1) = 180
4x + 1 + 3x - 3 + 2x + 2 = 180
4x + 3x + 2x = 180 - 1 + 3 - 2
9x = 180
x = 20
4(x + 1/4) = 4(20 + 1/4)
= 80 + 1
= 81°
3(x - 1) = 3(20 - 1)
= 60 - 3
= 57°
2(x + 1) = 2(20 + 1)
= 40 + 2
= 42°