A(x)=(300-2x)

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Solution for A(x)=(300-2x) equation: 



(A)=(300-2A)

We move all terms to the left:

(A)-((300-2A))=0

We add all the numbers together, and all the variables

A-((-2A+300))=0



We calculate terms in parentheses: -((-2A+300)), so:

(-2A+300)

We get rid of parentheses

-2A+300

Back to the equation:

-(-2A+300)



We get rid of parentheses

A+2A-300=0

We add all the numbers together, and all the variables

3A-300=0

We move all terms containing A to the left, all other terms to the right

3A=300

A=300/3

A=100

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