7(x=1)=21

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Solution for 7(x=1)=21 equation: 



7(x=1)=21

We move all terms to the left:

7(x-(1))=0

We multiply parentheses

7x-7=0

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

7x=7

x=7/7

x=1

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