2x(x+20)-40=2x(x+10)+20

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Solution for 2x(x+20)-40=2x(x+10)+20 equation: 



2x(x+20)-40=2x(x+10)+20

We move all terms to the left:

2x(x+20)-40-(2x(x+10)+20)=0

We multiply parentheses

2x^2+40x-(2x(x+10)+20)-40=0



We calculate terms in parentheses: -(2x(x+10)+20), so:

2x(x+10)+20

We multiply parentheses

2x^2+20x+20

Back to the equation:

-(2x^2+20x+20)



We get rid of parentheses

2x^2-2x^2+40x-20x-20-40=0

We add all the numbers together, and all the variables

20x-60=0

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

20x=60

x=60/20

x=3

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