Match the inventors with the inventions. 1. telephone bell 2. powered, human-piloted aircraft morse 3. incandescent light bulb wright 4. assembly line ford 5. telegraph howe 6. tom thumb whitney 7. clermont mccormick 8. sewing machine fulton 9. reaping machine edison 10. cotton gin cooper

simplify brackets

8 - 2a - 7 = a + 40

simplify 8 - 2a - 7 to -2a + 1

-2a + 1 = a + 40

add 2a to both sides

1 = a + 40 + 2a

simplify a + 40 + 2a to 3a + 40

1 = 3a + 40

subtract 40 from both sides

1 - 40 = 3a

simplify 1 - 40 o -39

-39 = 3a

divide both sides by 3

-39/3 = a

simplify 39/3 to 13

-13 = a

switch sides

a = -13