a+a+a+a+90+90=720

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Solution for a+a+a+a+90+90=720 equation: 



a+a+a+a+90+90=720

We move all terms to the left:

a+a+a+a+90+90-(720)=0

We add all the numbers together, and all the variables

4a-540=0

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

4a=540

a=540/4

a=135

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