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-4(7x+5)=-28x+20
We move all terms to the left:
-4(7x+5)-(-28x+20)=0
We multiply parentheses
-28x-(-28x+20)-20=0
We get rid of parentheses
-28x+28x-20-20=0
We add all the numbers together, and all the variables
-40!=0
There is no solution for this equation
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