(5+a)*5=75

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Solution for (5+a)*5=75 equation: 



(5+a)*5=75

We move all terms to the left:

(5+a)*5-(75)=0

We add all the numbers together, and all the variables

(a+5)*5-75=0

We multiply parentheses

5a+25-75=0

We add all the numbers together, and all the variables

5a-50=0

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

5a=50

a=50/5

a=10

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