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(1/4)*x-((7/8)*x) = 20-45 // - 20-45
(1/4)*x-((7/8)*x)-20+45 = 0
(1/4)*x+(-7/8)*x-20+45 = 0
25-5/8*x = 0 // - 25
-5/8*x = -25 // : -5/8
x = -25/(-5/8)
x = 40
x = 40
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