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(7/2)*x-6 = (-7/4)*x-(2/3) // - (-7/4)*x-(2/3)
(7/2)*x-((-7/4)*x)+2/3-6 = 0
(7/2)*x+(7/4)*x+2/3-6 = 0
21/4*x-16/3 = 0 // + 16/3
21/4*x = 16/3 // : 21/4
x = 16/3/21/4
x = 64/63
x = 64/63
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