10(i-1)=30

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



10(i-1)=30

We move all terms to the left:

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

We multiply parentheses

10i-10-30=0

We add all the numbers together, and all the variables

10i-40=0

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

10i=40

i=40/10

i=4

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