10(a-1)=30

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Solution for 10(a-1)=30 equation: 



10(a-1)=30

We move all terms to the left:

10(a-1)-(30)=0

We multiply parentheses

10a-10-30=0

We add all the numbers together, and all the variables

10a-40=0

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

10a=40

a=40/10

a=4

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