Question

40+80÷a=80


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Answer 1

$40 + \frac{80}{a} = 80 \\ \frac{80}{a} = 80 - 40 \\ \frac{80}{a} = 40 \\ a = \frac{80}{40} \\ a = 2$

Answer 2

a=80:2=40                                                                                                             a=40+40=80
a=40