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-5a/(-10)*10=100
We move all terms to the left:
-5a/(-10)*10-(100)=0
We multiply all the terms by the denominator
-5a-100*(-10)*10=0
We add all the numbers together, and all the variables
-5a+10000=0
We move all terms containing a to the left, all other terms to the right
-5a=-10000
a=-10000/-5
a=+2000
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