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x in (-oo:+oo)
-((3/4)*x)-x-4 = -25 // + 25
25-((3/4)*x)-x-4 = 0
(-3/4)*x-x-4+25 = 0
21-7/4*x = 0 // - 21
-7/4*x = -21 // : -7/4
x = -21/(-7/4)
x = 12
x = 12
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