(90)+(9x-19)+(111)+(5x+8)+(128)+(7x+3)=720

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Solution for (90)+(9x-19)+(111)+(5x+8)+(128)+(7x+3)=720 equation: 



(90)+(9x-19)+(111)+(5x+8)+(128)+(7x+3)=720

We move all terms to the left:

(90)+(9x-19)+(111)+(5x+8)+(128)+(7x+3)-(720)=0

We add all the numbers together, and all the variables

(9x-19)+(5x+8)+(7x+3)-391=0

We get rid of parentheses

9x+5x+7x-19+8+3-391=0

We add all the numbers together, and all the variables

21x-399=0

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

21x=399

x=399/21

x=19

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