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C(180-x) + S (90-3x) = 180 - 2x
90 - (180 - x ) + 180 - (90 - 3x) = 180 - 2x
90 - 180 + x + 180 - 90 +3 x = 180 - 2x
4x= 180- 2x
6x= 180
x= 30º