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

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



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

We move all terms to the left:

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