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Tenemos:
angulo = x
suplemento = S
complemento = C
SCS₍ₓ₎ = 8x
SC₍₁₈₀ ₋ ₓ₎ = 8x
S₍ₓ ₋ ₉₀₎ = 8x
270 - x = 8x
270 = 8x + x
270 = 9x
270 / 9 = x
30 = x
S₍₃ₓ₎ = 180 - 3x
S₍₃ₓ₎ = 180 - 3(30)
S₍₃ₓ₎ = 180 - 90
S₍₃ₓ₎ = 90