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(7a*24)+(3a*40)=666000
We move all terms to the left:
(7a*24)+(3a*40)-(666000)=0
We add all the numbers together, and all the variables
(+7a*24)+(+3a*40)-666000=0
We get rid of parentheses
7a*24+3a*40-666000=0
Wy multiply elements
168a+120a-666000=0
We add all the numbers together, and all the variables
288a-666000=0
We move all terms containing a to the left, all other terms to the right
288a=666000
a=666000/288
a=2312+1/2
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