That is written as A/(4+9) = 5.
The first step would be to multiply both sides by the denominator, which is 13 (when you add four plus nine). You will then come up with A=65, which is the final answer.
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One over nine is not equal to negative four. 1/9 is equivalent to 0.11111.
it equals six over nine or two over three
Five over eight. 5/8
5/7 − 4/9 = 17/63
y=10/7