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x in (-oo:+oo)
sin(55) = x/12 // - x/12
sin(55)-(x/12) = 0
sin(55)-1/12*x = 0 // - sin(55)
-1/12*x = -sin(55) // : -1/12
x = -sin(55)/(-1/12)
x = 12*sin(55)
x = 12*sin(55)
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