90=2(x/2-10.5)+21

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Solution for 90=2(x/2-10.5)+21 equation: 



90=2(x/2-10.5)+21

We move all terms to the left:

90-(2(x/2-10.5)+21)=0

We multiply all the terms by the denominator


-(2(x+90*2-10.5)+21)=0



We calculate terms in parentheses: -(2(x+90*2-10.5)+21), so:

2(x+90*2-10.5)+21

We add all the numbers together, and all the variables

2(x+169.5)+21

We multiply parentheses

2x+339+21

We add all the numbers together, and all the variables

2x+360

Back to the equation:

-(2x+360)



We get rid of parentheses

-2x-360=0

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

-2x=360

x=360/-2

x=-180

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