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x in (-oo:+oo)
sin(50) = x/18 // - x/18
sin(50)-(x/18) = 0
sin(50)-1/18*x = 0 // - sin(50)
-1/18*x = -sin(50) // : -1/18
x = -sin(50)/(-1/18)
x = 18*sin(50)
x = 18*sin(50)
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