[tex]7x - ( - 2x + 3) = 7x + (2x + 3) = 9x - 3[/tex]
[tex]9 - 3(x - 2) = 9 - (3x + 6) = - 3x + 15[/tex]
[tex] - 4(2a - b) + 2b - a = - 8 a + 4b + 2b - a = - 8a + 6b - a = - 9a + 6b[/tex]
[tex](10x + 2y) \div 2 = 5x + y[/tex]
[tex]( - 3a + 12) \div ( - 3) = - 3a + 12 \div ( - 3) = a - 4[/tex]
