90=7(1-2x)-1

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Solution for 90=7(1-2x)-1 equation: 



90=7(1-2x)-1

We move all terms to the left:

90-(7(1-2x)-1)=0

We add all the numbers together, and all the variables

-(7(-2x+1)-1)+90=0



We calculate terms in parentheses: -(7(-2x+1)-1), so:

7(-2x+1)-1

We multiply parentheses

-14x+7-1

We add all the numbers together, and all the variables

-14x+6

Back to the equation:

-(-14x+6)



We get rid of parentheses

14x-6+90=0

We add all the numbers together, and all the variables

14x+84=0

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

14x=-84

x=-84/14

x=-6

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