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x in (-oo:+oo)
1/4-(7*x) = 4 // - 4
1/4-(7*x)-4 = 0
1/4-7*x-4 = 0
-7*x-15/4 = 0 // + 15/4
-7*x = 15/4 // : -7
x = 15/4/(-7)
x = -15/28
x = -15/28
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