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8a=a-7*15a.
We move all terms to the left:
8a-(a-7*15a.)=0
We add all the numbers together, and all the variables
8a-(+a-7*15a.)=0
We get rid of parentheses
8a-a+7*15a.=0
We add all the numbers together, and all the variables
7a+7*15a.=0
Wy multiply elements
7a+105a=0
We add all the numbers together, and all the variables
112a=0
a=0/112
a=0
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