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20 = 3-((7/8)*x)-(3/4) // - 3-((7/8)*x)-(3/4)
(7/8)*x+3/4-3+20 = 0
7/8*x+71/4 = 0 // - 71/4
7/8*x = -71/4 // : 7/8
x = -71/4/7/8
x = -142/7
x = -142/7
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