[tex]0.2 + (a - 0.1) = 0.2 + a - 0.1 = a + 0.1[/tex]

[tex](c - 2) + 5 = c - 2 + 5 = c + 3[/tex]

[tex] - (a + 5) + 4 = - a - 5 + 4 = - a - 1[/tex]

[tex]1.8 - (a - 0.2) = 1.8 - a + 0.2 = 2 - a[/tex]

[tex](a - 3) - (b - 2) = a - 3 - b + 2 = a - b - 1[/tex]

[tex] - ( - x + 2) + (y + 1) = x - 2 + y + 1 = x + y - 1[/tex]