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21/8 = (11/4)*x-x // - (11/4)*x-x
x-((11/4)*x)+21/8 = 0
(-11/4)*x+x+21/8 = 0
21/8-7/4*x = 0 // - 21/8
-7/4*x = -21/8 // : -7/4
x = -21/8/(-7/4)
x = 3/2
x = 3/2
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