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3/4 = (3/8)*x-6 // - (3/8)*x-6
3/4-((3/8)*x)+6 = 0
(-3/8)*x+3/4+6 = 0
27/4-3/8*x = 0 // - 27/4
-3/8*x = -27/4 // : -3/8
x = -27/4/(-3/8)
x = 18
x = 18
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