(a-1)*2=4

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Solution for (a-1)*2=4 equation: 



(a-1)*2=4

We move all terms to the left:

(a-1)*2-(4)=0

We multiply parentheses

2a-2-4=0

We add all the numbers together, and all the variables

2a-6=0

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

2a=6

a=6/2

a=3

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