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7/2 = (7*x)/8-4 // - (7*x)/8-4
7/2-((7*x)/8)+4 = 0
(-7/8)*x+7/2+4 = 0
15/2-7/8*x = 0 // - 15/2
-7/8*x = -15/2 // : -7/8
x = -15/2/(-7/8)
x = 60/7
x = 60/7
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