[tex]3(x -5 ) + 4(7 - x) = 3 + x - 2(3 - x) \\ 3x - 15 + 28 - 4x = 3 + x - 6 + 2x \\ - x + 13 = - 3 + 3x \\ 13 + 3 = 3x + x \\ 16 = 4x \\ 4 = x[/tex]
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[tex]3(x -5 ) + 4(7 - x) = 3 + x - 2(3 - x) \\ 3x - 15 + 28 - 4x = 3 + x - 6 + 2x \\ - x + 13 = - 3 + 3x \\ 13 + 3 = 3x + x \\ 16 = 4x \\ 4 = x[/tex]