Where did american military planners decide to invade so b-29 could refuled

During the bombing of the B-29, the US decided to invade strategic points in the Asias that allowed for refueling. This included:

Iwo Jima, which was taken during the Battle of Iwo Jima, a bloody battle between the US marines and Japanese troops over a 13 mile stretch of land. The battle lasted for months, and ended with the termination of most Japanese defenders, and heavy casualties to the US.

However, with the taking of Iwo Jima, the US was able to save more planes that either were low on fuel or were heavily damaged, thus putting more pressure on Japan.

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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