2(6+x)=90

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Solution for 2(6+x)=90 equation: 



2(6+x)=90

We move all terms to the left:

2(6+x)-(90)=0

We add all the numbers together, and all the variables

2(x+6)-90=0

We multiply parentheses

2x+12-90=0

We add all the numbers together, and all the variables

2x-78=0

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

2x=78

x=78/2

x=39

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