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-3(7x-5)=-21x+5
We move all terms to the left:
-3(7x-5)-(-21x+5)=0
We multiply parentheses
-21x-(-21x+5)+15=0
We get rid of parentheses
-21x+21x-5+15=0
We add all the numbers together, and all the variables
10!=0
There is no solution for this equation
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