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x in (-oo:+oo)
-(7*x)-4 = -25 // + 25
25-(7*x)-4 = 0
25-7*x-4 = 0
21-7*x = 0 // - 21
-7*x = -21 // : -7
x = -21/(-7)
x = 3
x = 3
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