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x in (-oo:+oo)
sin(23) = x/4 // - x/4
sin(23)-(x/4) = 0
sin(23)-1/4*x = 0 // - sin(23)
-1/4*x = -sin(23) // : -1/4
x = -sin(23)/(-1/4)
x = 4*sin(23)
x = 4*sin(23)
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