[tex]8 +( x - y) = 8 + x - y \\ 6 - ( - x + y) = 6 + x - y \\ - 3 - (x + y) = - 3 - x - y \\ 9 - ( - a - d + c) = 9 + a + d - c[/tex]
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[tex]8 +( x - y) = 8 + x - y \\ 6 - ( - x + y) = 6 + x - y \\ - 3 - (x + y) = - 3 - x - y \\ 9 - ( - a - d + c) = 9 + a + d - c[/tex]