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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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