3a-7a+2=-18

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Solution for 3a-7a+2=-18 equation: 



3a-7a+2=-18

We move all terms to the left:

3a-7a+2-(-18)=0

We add all the numbers together, and all the variables

-4a+20=0

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

-4a=-20

a=-20/-4

a=+5

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