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5(1-7a)=250
We move all terms to the left:
5(1-7a)-(250)=0
We add all the numbers together, and all the variables
5(-7a+1)-250=0
We multiply parentheses
-35a+5-250=0
We add all the numbers together, and all the variables
-35a-245=0
We move all terms containing a to the left, all other terms to the right
-35a=245
a=245/-35
a=-7
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