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x in (-oo:+oo)
(1/4)*x-((7/8)*x) = 10-30 // - 10-30
(1/4)*x-((7/8)*x)-10+30 = 0
(1/4)*x+(-7/8)*x-10+30 = 0
20-5/8*x = 0 // - 20
-5/8*x = -20 // : -5/8
x = -20/(-5/8)
x = 32
x = 32
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