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x in (-oo:+oo)
4.7 = x/4 // - x/4
4.7-(x/4) = 0
4.7-1/4*x = 0 // - 4.7
-1/4*x = -4.7 // : -1/4
x = -4.7/(-1/4)
x = 18.8
x = 18.8
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