[tex] - (3x + 1) + (2x + 2) = 5x + 7 \\ - 3x - 1 + 2x + 2 = 5x + 7 \\ - x + 1 = 5x + 7 \\ - x - 5x = 7 - 1 \\ - 6x = 6 \\ x = - 1[/tex]