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x in (-oo:+oo)
-((3/8)*x)-4 = 26 // - 26
-((3/8)*x)-26-4 = 0
(-3/8)*x-26-4 = 0
-3/8*x-30 = 0 // + 30
-3/8*x = 30 // : -3/8
x = 30/(-3/8)
x = -80
x = -80
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