40a-20a=18-

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Solution for 40a-20a=18- equation: 



40a-20a=18-

We move all terms to the left:

40a-20a-(18-)=0

We add all the numbers together, and all the variables

40a-20a-0=0

We add all the numbers together, and all the variables

20a=0

a=0/20

a=0

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