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x in (-oo:+oo)
7.5 = x/4 // - x/4
7.5-(x/4) = 0
7.5-1/4*x = 0 // - 7.5
-1/4*x = -7.5 // : -1/4
x = -7.5/(-1/4)
x = 30
x = 30
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