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10a+5(240-2a)=1200
We move all terms to the left:
10a+5(240-2a)-(1200)=0
We add all the numbers together, and all the variables
10a+5(-2a+240)-1200=0
We multiply parentheses
10a-10a+1200-1200=0
We add all the numbers together, and all the variables
=0
a=0/1
a=0
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