7a+2a+4a=-45

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Solution for 7a+2a+4a=-45 equation: 



7a+2a+4a=-45

We move all terms to the left:

7a+2a+4a-(-45)=0

We add all the numbers together, and all the variables

13a+45=0

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

13a=-45

a=-45/13

a=-3+6/13

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