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x in (-oo:+oo)
x/4-7 = 2*x // - 2*x
x/4-(2*x)-7 = 0
x/4-2*x-7 = 0
-7/4*x-7 = 0 // + 7
-7/4*x = 7 // : -7/4
x = 7/(-7/4)
x = -4
x = -4
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