45+135+3x+45+x+135=720

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Solution for 45+135+3x+45+x+135=720 equation: 



45+135+3x+45+x+135=720

We move all terms to the left:

45+135+3x+45+x+135-(720)=0

We add all the numbers together, and all the variables

4x-360=0

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

4x=360

x=360/4

x=90

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