During the nineteenth century, one way political bosses gained voter support was by     F. Campaigning for women’s sufferag     G. Advocating the use of poll taxes     H. Making improvements to the urban infrastructure and assisting immigrants with  naturalization    
J. Providing public assistance for former slaves​

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the answer is a. mothma gupta.

6 units. ab and lo are congruent sides, and if ab= 6 units, then lo would be the same.

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