2(a-1)=10

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Solution for 2(a-1)=10 equation: 



2(a-1)=10

We move all terms to the left:

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

We multiply parentheses

2a-2-10=0

We add all the numbers together, and all the variables

2a-12=0

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

2a=12

a=12/2

a=6

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