(60a+30)-(30a-30)=90

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Solution for (60a+30)-(30a-30)=90 equation: 



(60a+30)-(30a-30)=90

We move all terms to the left:

(60a+30)-(30a-30)-(90)=0

We get rid of parentheses

60a-30a+30+30-90=0

We add all the numbers together, and all the variables

30a-30=0

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

30a=30

a=30/30

a=1

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