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sin(30) = x/4-x // - x/4-x
x-(x/4)+sin(30) = 0
3/4*x+sin(30) = 0 // - sin(30)
3/4*x = -sin(30) // : 3/4
x = -sin(30)/3/4
x = -4/3*sin(30)
x = -4/3*sin(30)
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