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x in (-oo:+oo)
(1/4)*x-((7/8)*x) = 30-70 // - 30-70
(1/4)*x-((7/8)*x)-30+70 = 0
(1/4)*x+(-7/8)*x-30+70 = 0
40-5/8*x = 0 // - 40
-5/8*x = -40 // : -5/8
x = -40/(-5/8)
x = 64
x = 64
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