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x in (-oo:+oo)
sin(40) = x/8 // - x/8
sin(40)-(x/8) = 0
sin(40)-1/8*x = 0 // - sin(40)
-1/8*x = -sin(40) // : -1/8
x = -sin(40)/(-1/8)
x = 8*sin(40)
x = 8*sin(40)
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