. During the election of 1980, emphasized peacemaking.

During the election of 1980, Jimmy Carter emphasized peacemaking.

Explanation:

President Jimmy Carter is one of only four American presidents who have won the Nobel Peace Prize.  In 2002, the Nobel Committee recognized Carter "for his decades of untiring effort to find peaceful solutions to international conflicts, to advance democracy and human rights, and to promote economic and social development."  Carter, served as the 39th president from 1977 until 1981. His campaign emphasized peacemaking.

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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