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x in (-oo:+oo)
7-((1/4)*x) = 3 // - 3
7-((1/4)*x)-3 = 0
(-1/4)*x-3+7 = 0
4-1/4*x = 0 // - 4
-1/4*x = -4 // : -1/4
x = -4/(-1/4)
x = 16
x = 16
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